CSS 29 💻 align-content and align-self properties - KandZ

These two properties complete the Flexbox alignment toolkit. align-content controls how multiple lines are distributed along the cross axis, while align-self lets you override the container’s align-items for individual items.

Overview of Properties

Property	Applies To	Description
`align-content`	Container	Aligns multiple lines along the cross axis
`align-self`	Item	Overrides `align-items` for a single item

1. align-content

The align-content property controls the alignment of flex lines along the cross axis. It only works when:

The container has flex-wrap: wrap (or wrap-reverse)
There are multiple lines of items
There is extra space in the container

.container {
    display: flex;
    flex-wrap: wrap;
    height: 400px;
    align-content: center;
}

Values

Value	Description	Visual
`stretch`	Lines stretch to fill container (default)	Lines fill height
`flex-start`	Lines packed at start	`[1][2]` `[3][4]`
`flex-end`	Lines packed at end	`[1][2]` `[3][4]`
`center`	Lines centered	`[1][2]` `[3][4]`
`space-between`	First at start, last at end	`[1][2]` `[3][4]`
`space-around`	Equal space around each line	`[1][2]` `[3][4]`
`space-evenly`	Equal space everywhere	`[1][2]` `[3][4]`

Important: align-content has no effect if:

flex-wrap: nowrap (single line)
There’s only one line of items
There’s no extra space in the container

2. align-self

The align-self property allows an individual flex item to override the container’s align-items value.

.item2 {
    align-self: flex-start; /* This item aligns differently */
}

Values

Same as align-items:

Value	Description
`auto`	Inherits from parent’s `align-items` (default)
`stretch`	Stretches to fill container
`flex-start`	Aligns to the start
`flex-end`	Aligns to the end
`center`	Centers the item
`baseline`	Aligns to text baseline

align-content vs align-items

Aspect	align-content	align-items
Applies to	Multiple lines	Items within a line
When it works	`flex-wrap: wrap` + multiple lines	Always (single or multi-line)
Axis	Cross axis	Cross axis
Controls	Distribution of lines	Alignment of items
Number of lines	Only multi-line	Single or multi-line

Visual difference:

align-items: center          align-content: center
┌─────────────────┐          ┌─────────────────┐
│                 │          │                 │
│  [1] [2] [3]    │          │  [1] [2] [3]    │
│                 │          │  [4] [5] [6]    │
│                 │          │                 │
└─────────────────┘          └─────────────────┘
   Items centered             Lines centered
   within each line           as a group

Complete Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>align-content and align-self Properties</title>
    <style>
        *, *::before, *::after {
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background: #f8f9fa;
            line-height: 1.6;
        }

        h1 {
            color: #007bff;
            border-bottom: 3px solid #007bff;
            padding-bottom: 10px;
        }

        h2 {
            color: #28a745;
            border-left: 4px solid #28a745;
            padding-left: 15px;
            margin-top: 30px;
        }

        h3 {
            color: #333;
            margin-top: 20px;
        }

        section {
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            margin: 20px 0;
        }

        .code-block {
            background: #1e1e1e;
            color: #d4d4d4;
            padding: 15px;
            border-radius: 8px;
            overflow-x: auto;
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
            line-height: 1.8;
            margin: 10px 0;
        }

        .reference-table {
            width: 100%;
            border-collapse: collapse;
            margin: 15px 0;
        }

        .reference-table th,
        .reference-table td {
            padding: 10px;
            border: 1px solid #ddd;
            text-align: left;
        }

        .reference-table th {
            background: #007bff;
            color: white;
        }

        .reference-table tr:nth-child(even) {
            background: #f8f9fa;
        }

        .note {
            font-size: 0.9rem;
            color: #6c757d;
            margin-top: 5px;
        }

        .highlight {
            background: #ffc107;
            color: #333;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: bold;
        }

        /* ====== FLEX CONTAINERS ====== */
        .container {
            display: flex;
            flex-wrap: wrap;
            height: 300px;
            border: 2px solid #333;
            margin: 10px 0;
            padding: 5px;
            background: #e9ecef;
            border-radius: 8px;
            gap: 5px;
        }

        .item {
            background: #007bff;
            color: white;
            padding: 15px;
            margin: 3px;
            text-align: center;
            width: 200px;
            border-radius: 6px;
            font-weight: bold;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .item:nth-child(even) {
            background: #28a745;
        }

        .item:nth-child(3n) {
            background: #6c5ce7;
        }

        /* align-content demos */
        .ac-stretch {
            align-content: stretch;
        }

        .ac-start {
            align-content: flex-start;
        }

        .ac-end {
            align-content: flex-end;
        }

        .ac-center {
            align-content: center;
        }

        .ac-between {
            align-content: space-between;
        }

        .ac-around {
            align-content: space-around;
        }

        .ac-evenly {
            align-content: space-evenly;
        }

        /* align-self demo */
        .container-self {
            display: flex;
            height: 300px;
            border: 2px solid #333;
            margin: 10px 0;
            padding: 5px;
            background: #e9ecef;
            border-radius: 8px;
            gap: 5px;
        }

        .container-self .item {
            width: auto;
            flex: 1;
            min-width: 80px;
        }

        .container-self .item1 {
            align-self: stretch;
            background: #007bff;
        }

        .container-self .item2 {
            align-self: flex-start;
            background: #28a745;
        }

        .container-self .item3 {
            align-self: flex-end;
            background: #dc3545;
        }

        .container-self .item4 {
            align-self: center;
            background: #ffc107;
            color: #333;
        }

        .container-self .item5 {
            align-self: baseline;
            background: #17a2b8;
        }

        /* Comparison grid */
        .comparison-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .comparison-item {
            text-align: center;
        }

        .comparison-item h4 {
            margin-bottom: 5px;
            color: #007bff;
        }

        .comparison-item .container {
            margin: 5px 0;
            height: 200px;
        }

        .comparison-item .item {
            width: auto;
            flex: 1;
            min-width: 60px;
            font-size: 0.8rem;
            padding: 10px 5px;
        }

        /* Visual explanation */
        .visual-explanation {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            margin: 20px 0;
        }

        .visual-row {
            display: flex;
            align-items: center;
            gap: 10px;
            width: 100%;
            max-width: 700px;
        }

        .visual-label {
            font-weight: bold;
            color: #007bff;
            min-width: 160px;
            text-align: right;
            font-size: 0.85rem;
        }

        .visual-bar {
            flex: 1;
            height: 120px;
            background: #e9ecef;
            border-radius: 6px;
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px;
            border: 1px solid #ddd;
            gap: 5px;
        }

        .visual-bar .line {
            display: flex;
            gap: 5px;
            padding: 5px 10px;
            background: #007bff;
            border-radius: 4px;
            color: white;
            font-size: 0.7rem;
            font-weight: bold;
        }

        .visual-bar .line:nth-child(even) {
            background: #28a745;
        }
    </style>
</head>
<body>

    <h1>align-content and align-self Properties</h1>

    <!-- ====== 1. ALIGN-CONTENT ====== -->
    <section>
        <h2>1. align-content</h2>
        <p>Aligns <strong>multiple lines</strong> along the cross axis. Only works with <code>flex-wrap: wrap</code> and multiple lines.</p>

        <h3>align-content: stretch (default)</h3>
        <div class="container ac-stretch">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>
        <p class="note">Lines stretch to fill the container's height.</p>

        <h3>align-content: flex-start</h3>
        <div class="container ac-start">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <h3>align-content: flex-end</h3>
        <div class="container ac-end">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <h3>align-content: center</h3>
        <div class="container ac-center">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <h3>align-content: space-between</h3>
        <div class="container ac-between">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <h3>align-content: space-around</h3>
        <div class="container ac-around">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <h3>align-content: space-evenly</h3>
        <div class="container ac-evenly">
            <div class="item">Item 1</div>
            <div class="item">Item 2</div>
            <div class="item">Item 3</div>
            <div class="item">Item 4</div>
            <div class="item">Item 5</div>
        </div>

        <div class="code-block">
            .container {
                display: flex;
                flex-wrap: wrap;
                height: 300px;
                align-content: stretch;      /* Default — fills height */
                align-content: flex-start;   /* Packed at start */
                align-content: flex-end;     /* Packed at end */
                align-content: center;       /* Centered */
                align-content: space-between;/* First at start, last at end */
                align-content: space-around; /* Equal space around lines */
                align-content: space-evenly; /* Equal space everywhere */
            }
        </div>
    </section>

    <!-- ====== 2. ALIGN-SELF ====== -->
    <section>
        <h2>2. align-self</h2>
        <p>Overrides <code>align-items</code> for an <strong>individual item</strong>.</p>

        <div class="container-self">
            <div class="item item1">align-self: stretch</div>
            <div class="item item2">align-self: flex-start</div>
            <div class="item item3">align-self: flex-end</div>
            <div class="item item4">align-self: center</div>
            <div class="item item5">align-self: baseline</div>
        </div>

        <p class="note">Each item has a different <code>align-self</code> value, overriding the container's default alignment.</p>

        <div class="code-block">
            .item1 { align-self: stretch; }     /* Stretches to fill */
            .item2 { align-self: flex-start; }  /* Top */
            .item3 { align-self: flex-end; }    /* Bottom */
            .item4 { align-self: center; }      /* Center */
            .item5 { align-self: baseline; }    /* Text baseline */
        </div>
    </section>

    <!-- ====== 3. SIDE-BY-SIDE COMPARISON ====== -->
    <section>
        <h2>3. Side-by-Side Comparison</h2>

        <h3>align-content (multi-line distribution)</h3>
        <div class="comparison-grid">
            <div class="comparison-item">
                <h4>stretch (default)</h4>
                <div class="container ac-stretch">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
            <div class="comparison-item">
                <h4>flex-start</h4>
                <div class="container ac-start">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
            <div class="comparison-item">
                <h4>center</h4>
                <div class="container ac-center">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
            <div class="comparison-item">
                <h4>space-between</h4>
                <div class="container ac-between">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
            <div class="comparison-item">
                <h4>space-around</h4>
                <div class="container ac-around">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
            <div class="comparison-item">
                <h4>space-evenly</h4>
                <div class="container ac-evenly">
                    <div class="item">1</div>
                    <div class="item">2</div>
                    <div class="item">3</div>
                    <div class="item">4</div>
                </div>
            </div>
        </div>
    </section>

    <!-- ====== 4. VISUAL EXPLANATION ====== -->
    <section>
        <h2>4. Visual Explanation</h2>
        <p>See how <code>align-content</code> distributes multiple lines.</p>

        <div class="visual-explanation">
            <div class="visual-row">
                <div class="visual-label">flex-start:</div>
                <div class="visual-bar" style="justify-content: flex-start;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
            <div class="visual-row">
                <div class="visual-label">center:</div>
                <div class="visual-bar" style="justify-content: center;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
            <div class="visual-row">
                <div class="visual-label">flex-end:</div>
                <div class="visual-bar" style="justify-content: flex-end;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
            <div class="visual-row">
                <div class="visual-label">space-between:</div>
                <div class="visual-bar" style="justify-content: space-between;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
            <div class="visual-row">
                <div class="visual-label">space-around:</div>
                <div class="visual-bar" style="justify-content: space-around;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
            <div class="visual-row">
                <div class="visual-label">space-evenly:</div>
                <div class="visual-bar" style="justify-content: space-evenly;">
                    <div class="line">Line 1</div>
                    <div class="line">Line 2</div>
                    <div class="line">Line 3</div>
                </div>
            </div>
        </div>
    </section>

    <!-- ====== 5. REFERENCE TABLES ====== -->
    <section>
        <h2>5. Reference Tables</h2>

        <h3>align-content Values</h3>
        <table class="reference-table">
            <tr>
                <th>Value</th>
                <th>Description</th>
                <th>Space at Edges</th>
            </tr>
            <tr>
                <td><code>stretch</code></td>
                <td>Lines stretch to fill container (default)</td>
                <td>—</td>
            </tr>
            <tr>
                <td><code>flex-start</code></td>
                <td>Lines packed at start</td>
                <td>No</td>
            </tr>
            <tr>
                <td><code>flex-end</code></td>
                <td>Lines packed at end</td>
                <td>No</td>
            </tr>
            <tr>
                <td><code>center</code></td>
                <td>Lines centered</td>
                <td>Equal at both ends</td>
            </tr>
            <tr>
                <td><code>space-between</code></td>
                <td>Equal space between lines</td>
                <td>No</td>
            </tr>
            <tr>
                <td><code>space-around</code></td>
                <td>Equal space around lines</td>
                <td>Half space</td>
            </tr>
            <tr>
                <td><code>space-evenly</code></td>
                <td>Equal space everywhere</td>
                <td>Full space</td>
            </tr>
        </table>

        <h3>align-self Values</h3>
        <table class="reference-table">
            <tr>
                <th>Value</th>
                <th>Description</th>
            </tr>
            <tr>
                <td><code>auto</code></td>
                <td>Inherits from parent's align-items (default)</td>
            </tr>
            <tr>
                <td><code>stretch</code></td>
                <td>Stretches to fill container</td>
            </tr>
            <tr>
                <td><code>flex-start</code></td>
                <td>Aligns to the start</td>
            </tr>
            <tr>
                <td><code>flex-end</code></td>
                <td>Aligns to the end</td>
            </tr>
            <tr>
                <td><code>center</code></td>
                <td>Centers the item</td>
            </tr>
            <tr>
                <td><code>baseline</code></td>
                <td>Aligns to text baseline</td>
            </tr>
        </table>

        <h3>align-content vs align-items</h3>
        <table class="reference-table">
            <tr>
                <th>Aspect</th>
                <th>align-content</th>
                <th>align-items</th>
            </tr>
            <tr>
                <td><strong>Applies to</strong></td>
                <td>Multiple lines</td>
                <td>Items within a line</td>
            </tr>
            <tr>
                <td><strong>When it works</strong></td>
                <td><code>flex-wrap: wrap</code> + multiple lines</td>
                <td>Always</td>
            </tr>
            <tr>
                <td><strong>Controls</strong></td>
                <td>Distribution of lines</td>
                <td>Alignment of items</td>
            </tr>
            <tr>
                <td><strong>Number of lines</strong></td>
                <td>Multi-line only</td>
                <td>Single or multi-line</td>
            </tr>
        </table>
    </section>

    <!-- ====== 6. BEST PRACTICES ====== -->
    <section>
        <h2>6. Best Practices</h2>

        <div style="background: #d4edda; padding: 20px; border-radius: 8px; border-left: 4px solid #28a745;">
            <h3 style="margin-top: 0; color: #155724;">✅ Do This:</h3>
            <ul>
                <li>Use <code>align-content</code> only with <code>flex-wrap: wrap</code></li>
                <li>Use <code>align-self</code> to override alignment for specific items</li>
                <li>Use <code>align-content: center</code> to center multiple lines vertically</li>
                <li>Use <code>align-self: flex-start</code> for items that need to stick to the top</li>
                <li>Remember that <code>align-content</code> has no effect with a single line</li>
            </ul>
        </div>

        <div style="background: #f8d7da; padding: 20px; border-radius: 8px; border-left: 4px solid #dc3545; margin-top: 15px;">
            <h3 style="margin-top: 0; color: #721c24;">❌ Don't Do This:</h3>
            <ul>
                <li>Don't use <code>align-content</code> without <code>flex-wrap: wrap</code></li>
                <li>Don't confuse <code>align-content</code> (lines) with <code>align-items</code> (items)</li>
                <li>Don't forget that <code>align-self</code> overrides <code>align-items</code> for one item</li>
                <li>Don't use <code>align-content</code> on single-line containers</li>
            </ul>
        </div>
    </section>

</body>
</html>

Quick Reference

Property	Applies To	Description
`align-content`	Container	Aligns multiple lines along the cross axis
`align-self`	Item	Overrides `align-items` for one item

align-content Values

Value	Description
`stretch`	Lines stretch to fill container (default)
`flex-start`	Lines packed at start
`flex-end`	Lines packed at end
`center`	Lines centered
`space-between`	First at start, last at end
`space-around`	Equal space around lines
`space-evenly`	Equal space everywhere

align-content vs align-items

Aspect	align-content	align-items
Applies to	Multiple lines	Items within a line
When it works	`flex-wrap: wrap` + multiple lines	Always
Controls	Distribution of lines	Alignment of items
Single line	No effect	Works

Best Practices

✅ Do This:

/* Center multiple lines vertically */
.container {
    display: flex;
    flex-wrap: wrap;
    height: 400px;
    align-content: center; /* Centers lines as a group */
}

/* Override alignment for one item */
.special-item {
    align-self: flex-start; /* This item aligns to the top */
}

/* Distribute lines evenly */
.container {
    display: flex;
    flex-wrap: wrap;
    align-content: space-between;
}

❌ Don’t Do This:

/* Don't use align-content without wrap */
.container {
    display: flex;
    flex-wrap: nowrap; /* align-content has NO effect */
    align-content: center;
}

/* Don't confuse align-content and align-items */
.container {
    align-content: center; /* Centers LINES, not items */
    align-items: center;   /* Centers ITEMS within lines */
}

Pro Tip: align-content is often confused with align-items. The key difference: align-items aligns items within each line, while align-content aligns the lines themselves as a group. Remember: align-content only works when you have multiple lines (i.e., flex-wrap: wrap and enough items to wrap). And align-self is your escape hatch — it lets a single item break away from the container’s align-items rule and align itself independently!

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Overview of Properties

1. align-content

Values

2. align-self

Values

align-content vs align-items

Complete Example

Quick Reference

align-content Values

align-content vs align-items

Best Practices

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