CSS 53 💻 transitions
CSS transitions let you smoothly animate changes to CSS properties over a specified duration. They add polish, interactivity, and visual appeal — turning abrupt state changes into fluid motion.
What is a Transition?
A transition defines how a CSS property changes from one state to another over time. Instead of instantly jumping from red to blue, the color gradually shifts over the specified duration.
Key Benefits
| Benefit | Description |
|---|---|
| Smooth animations | Gradual changes instead of instant jumps |
| Interactivity | Responds to hover, focus, and active states |
| Performance | Hardware-accelerated for transform and opacity |
| Simplicity | Pure CSS — no JavaScript required |
| Customizable | Control duration, timing, and delay |
The Four Transition Properties
The transition shorthand combines four individual properties:
| Property | Description | Default |
|---|---|---|
transition-property | Which property to animate | all |
transition-duration | How long the transition takes | 0s |
transition-timing-function | Speed curve of the transition | ease |
transition-delay | Wait before starting | 0s |
1. transition-property
Specifies which CSS property should transition.
.box {
transition-property: background-color, transform;
}| Value | Description |
|---|---|
none | No property transitions |
all | All animatable properties transition |
property-name | Specific property (e.g., background-color) |
| Multiple | Comma-separated list |
Best practice: Specify individual properties rather than all for better performance.
2. transition-duration
Specifies how long the transition takes.
.box {
transition-duration: 0.5s;
}| Value | Description |
|---|---|
0s | No transition (instant) |
0.5s | Half a second |
1s | One second |
500ms | 500 milliseconds (same as 0.5s) |
Note: If duration is 0s, the transition is instant — no animation occurs.
3. transition-timing-function
Specifies the speed curve of the transition.
.box {
transition-timing-function: ease-in-out;
}| Value | Description |
|---|---|
ease | Slow start, fast middle, slow end (default) |
linear | Constant speed |
ease-in | Slow start, fast end |
ease-out | Fast start, slow end |
ease-in-out | Slow start, fast middle, slow end |
cubic-bezier(n,n,n,n) | Custom curve |
steps(n) | Stepped animation |
4. transition-delay
Specifies how long to wait before starting the transition.
.box {
transition-delay: 0.2s;
}| Value | Description |
|---|---|
0s | Start immediately (default) |
0.2s | Wait 200ms before starting |
1s | Wait 1 second |
The transition Shorthand
/* Syntax */
transition: <property> <duration> <timing-function> <delay>;
/* Examples */
transition: background-color 0.5s ease; /* property, duration, timing */
transition: transform 0.3s ease-in-out 0.1s; /* all four values */
transition: background-color 0.5s, transform 0.3s; /* multiple properties */
transition: all 0.3s ease; /* all properties */Complete Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CSS Transitions</title>
<style>
*, *::before, *::after {
box-sizing: border-box;
}
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
padding: 20px;
background: #f8f9fa;
color: #333;
max-width: 1200px;
margin: 0 auto;
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;
}
/* ====== DEMO AREA ====== */
.demo-area {
display: flex;
flex-wrap: wrap;
gap: 30px;
justify-content: center;
align-items: center;
padding: 40px 20px;
background: #e9ecef;
border-radius: 8px;
margin: 15px 0;
min-height: 200px;
}
.box {
width: 120px;
height: 120px;
background: #007bff;
color: white;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
font-size: 0.85rem;
border-radius: 12px;
cursor: pointer;
text-align: center;
padding: 10px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
/* ====== BASIC TRANSITION ====== */
.transition-box {
width: 150px;
height: 150px;
background-color: #dc3545;
color: white;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
border-radius: 12px;
transition: background-color 0.5s ease, transform 0.3s ease;
cursor: pointer;
text-align: center;
padding: 10px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
.transition-box:hover {
background-color: #007bff;
transform: scale(1.2);
}
/* ====== TIMING FUNCTIONS ====== */
.timing-ease {
transition: transform 1s ease;
}
.timing-ease:hover {
transform: translateX(100px);
}
.timing-linear {
transition: transform 1s linear;
}
.timing-linear:hover {
transform: translateX(100px);
}
.timing-ease-in {
transition: transform 1s ease-in;
}
.timing-ease-in:hover {
transform: translateX(100px);
}
.timing-ease-out {
transition: transform 1s ease-out;
}
.timing-ease-out:hover {
transform: translateX(100px);
}
.timing-ease-in-out {
transition: transform 1s ease-in-out;
}
.timing-ease-in-out:hover {
transform: translateX(100px);
}
.timing-custom {
transition: transform 1s cubic-bezier(0, 1, 1, 0);
}
.timing-custom:hover {
transform: translateX(100px);
}
/* ====== DURATION COMPARISON ====== */
.duration-fast {
transition: transform 0.2s ease;
}
.duration-fast:hover {
transform: scale(1.3);
}
.duration-medium {
transition: transform 0.5s ease;
}
.duration-medium:hover {
transform: scale(1.3);
}
.duration-slow {
transition: transform 1.5s ease;
}
.duration-slow:hover {
transform: scale(1.3);
}
/* ====== DELAY COMPARISON ====== */
.delay-none {
transition: transform 0.5s ease 0s;
}
.delay-none:hover {
transform: translateY(-30px);
}
.delay-short {
transition: transform 0.5s ease 0.2s;
}
.delay-short:hover {
transform: translateY(-30px);
}
.delay-long {
transition: transform 0.5s ease 0.5s;
}
.delay-long:hover {
transform: translateY(-30px);
}
/* ====== MULTIPLE PROPERTIES ====== */
.multi-transition {
transition:
background-color 0.5s ease,
transform 0.3s ease,
border-radius 0.4s ease,
box-shadow 0.5s ease;
}
.multi-transition:hover {
background-color: #28a745;
transform: rotate(10deg) scale(1.1);
border-radius: 50%;
box-shadow: 0 10px 30px rgba(40, 167, 69, 0.4);
}
/* ====== PRACTICAL: BUTTON ====== */
.btn-transition {
padding: 15px 35px;
background: #007bff;
color: white;
border: none;
border-radius: 8px;
font-size: 1em;
font-weight: bold;
cursor: pointer;
transition: all 0.3s ease;
margin: 5px;
}
.btn-transition:hover {
background: #28a745;
transform: translateY(-3px);
box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
}
.btn-transition:active {
transform: translateY(-1px);
box-shadow: 0 4px 10px rgba(40, 167, 69, 0.2);
}
/* ====== PRACTICAL: CARD ====== */
.card-transition {
background: white;
border: 2px solid #ddd;
border-radius: 12px;
padding: 25px;
max-width: 300px;
margin: 15px auto;
transition: all 0.3s ease;
cursor: pointer;
text-align: center;
}
.card-transition:hover {
transform: translateY(-8px);
border-color: #007bff;
box-shadow: 0 15px 35px rgba(0, 123, 255, 0.15);
}
.card-transition h4 {
margin-top: 0;
color: #007bff;
transition: color 0.3s ease;
}
.card-transition:hover h4 {
color: #28a745;
}
/* ====== PRACTICAL: TOGGLE SWITCH ====== */
.toggle-switch {
position: relative;
width: 70px;
height: 36px;
background: #ccc;
border-radius: 18px;
cursor: pointer;
transition: background 0.3s ease;
margin: 20px auto;
}
.toggle-switch::after {
content: "";
position: absolute;
top: 3px;
left: 3px;
width: 30px;
height: 30px;
background: white;
border-radius: 50%;
transition: transform 0.3s ease, background 0.3s ease;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.toggle-switch:hover {
background: #28a745;
}
.toggle-switch:hover::after {
transform: translateX(34px);
background: #fff;
}
/* ====== PRACTICAL: FADE-IN ====== */
.fade-container {
display: flex;
gap: 20px;
justify-content: center;
flex-wrap: wrap;
margin: 15px 0;
}
.fade-box {
width: 100px;
height: 100px;
background: linear-gradient(135deg, #007bff, #6c5ce7);
border-radius: 12px;
display: flex;
align-items: center;
justify-content: center;
color: white;
font-weight: bold;
font-size: 0.8rem;
opacity: 0.3;
transition: opacity 0.5s ease, transform 0.5s ease;
cursor: pointer;
}
.fade-box:hover {
opacity: 1;
transform: translateY(-10px);
}
/* ====== TIPS ====== */
.tip-box {
padding: 15px;
border-radius: 8px;
margin: 10px 0;
border-left: 4px solid #007bff;
background: #f8f9fa;
}
.tip-box.success { border-left-color: #28a745; }
.tip-box.warning { border-left-color: #ffc107; }
.tip-box.danger { border-left-color: #dc3545; }
</style>
</head>
<body>
<h1>CSS Transitions</h1>
<!-- ====== 1. BASIC TRANSITION ====== -->
<section>
<h2>1. Basic Transition</h2>
<p>Hover over the box to see the smooth transition.</p>
<div class="demo-area">
<div class="transition-box">Hover Over Me!</div>
</div>
<div class="code-block">
.transition-box {
transition: background-color 0.5s ease, transform 0.3s ease;
}
.transition-box:hover {
background-color: #007bff;
transform: scale(1.2);
}
</div>
</section>
<!-- ====== 2. TIMING FUNCTIONS ====== -->
<section>
<h2>2. Timing Functions</h2>
<p>Each box uses a different timing function. Hover to compare the motion.</p>
<div class="demo-area" style="flex-direction: column; gap: 15px;">
<div class="box timing-ease" style="width: 200px; height: 60px;">ease (default)</div>
<div class="box timing-linear" style="width: 200px; height: 60px; background: #28a745;">linear</div>
<div class="box timing-ease-in" style="width: 200px; height: 60px; background: #dc3545;">ease-in</div>
<div class="box timing-ease-out" style="width: 200px; height: 60px; background: #ffc107; color: #333;">ease-out</div>
<div class="box timing-ease-in-out" style="width: 200px; height: 60px; background: #6c5ce7;">ease-in-out</div>
<div class="box timing-custom" style="width: 200px; height: 60px; background: #17a2b8;">cubic-bezier(0,1,1,0)</div>
</div>
<div class="code-block">
.timing-ease { transition: transform 1s ease; }
.timing-linear { transition: transform 1s linear; }
.timing-ease-in { transition: transform 1s ease-in; }
.timing-ease-out { transition: transform 1s ease-out; }
.timing-ease-in-out { transition: transform 1s ease-in-out; }
.timing-custom { transition: transform 1s cubic-bezier(0, 1, 1, 0); }
</div>
</section>
<!-- ====== 3. DURATION COMPARISON ====== -->
<section>
<h2>3. Duration Comparison</h2>
<p>Each box uses a different duration. Hover to compare the speed.</p>
<div class="demo-area">
<div class="box duration-fast" style="background: #28a745;">0.2s</div>
<div class="box duration-medium" style="background: #ffc107; color: #333;">0.5s</div>
<div class="box duration-slow" style="background: #dc3545;">1.5s</div>
</div>
<div class="code-block">
.duration-fast { transition: transform 0.2s ease; }
.duration-medium { transition: transform 0.5s ease; }
.duration-slow { transition: transform 1.5s ease; }
</div>
</section>
<!-- ====== 4. DELAY COMPARISON ====== -->
<section>
<h2>4. Delay Comparison</h2>
<p>Each box has a different delay before the transition starts.</p>
<div class="demo-area">
<div class="box delay-none" style="background: #007bff;">0s delay</div>
<div class="box delay-short" style="background: #28a745;">0.2s delay</div>
<div class="box delay-long" style="background: #dc3545;">0.5s delay</div>
</div>
<div class="code-block">
.delay-none { transition: transform 0.5s ease 0s; }
.delay-short { transition: transform 0.5s ease 0.2s; }
.delay-long { transition: transform 0.5s ease 0.5s; }
</div>
</section>
<!-- ====== 5. MULTIPLE PROPERTIES ====== -->
<section>
<h2>5. Multiple Properties</h2>
<p>This box transitions multiple properties at once — background, transform, border-radius, and shadow.</p>
<div class="demo-area">
<div class="box multi-transition">Hover Me</div>
</div>
<div class="code-block">
.multi-transition {
transition:
background-color 0.5s ease,
transform 0.3s ease,
border-radius 0.4s ease,
box-shadow 0.5s ease;
}
.multi-transition:hover {
background-color: #28a745;
transform: rotate(10deg) scale(1.1);
border-radius: 50%;
box-shadow: 0 10px 30px rgba(40, 167, 69, 0.4);
}
</div>
</section>
<!-- ====== 6. PRACTICAL: BUTTON ====== -->
<section>
<h2>6. Practical Example: Button</h2>
<p>Hover and click the buttons to see the transition effects.</p>
<div style="text-align: center; margin: 15px 0;">
<button class="btn-transition">Hover Me</button>
<button class="btn-transition">Click Me</button>
<button class="btn-transition">Press Me</button>
</div>
<div class="code-block">
.btn-transition {
transition: all 0.3s ease;
}
.btn-transition:hover {
background: #28a745;
transform: translateY(-3px);
box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
}
.btn-transition:active {
transform: translateY(-1px);
box-shadow: 0 4px 10px rgba(40, 167, 69, 0.2);
}
</div>
</section>
<!-- ====== 7. PRACTICAL: CARD ====== -->
<section>
<h2>7. Practical Example: Card</h2>
<p>Hover over the card to see the lift and shadow transition.</p>
<div class="card-transition">
<h4>Interactive Card</h4>
<p>Hover over this card to see the transition effect. The border color, shadow, and position all transition smoothly.</p>
</div>
<div class="code-block">
.card-transition {
transition: all 0.3s ease;
}
.card-transition:hover {
transform: translateY(-8px);
border-color: #007bff;
box-shadow: 0 15px 35px rgba(0, 123, 255, 0.15);
}
.card-transition h4 {
transition: color 0.3s ease;
}
.card-transition:hover h4 {
color: #28a745;
}
</div>
</section>
<!-- ====== 8. PRACTICAL: TOGGLE SWITCH ====== -->
<section>
<h2>8. Practical Example: Toggle Switch</h2>
<p>Hover over the switch to see the transition effect.</p>
<div style="text-align: center;">
<div class="toggle-switch"></div>
</div>
<div class="code-block">
.toggle-switch {
transition: background 0.3s ease;
}
.toggle-switch::after {
transition: transform 0.3s ease, background 0.3s ease;
}
.toggle-switch:hover {
background: #28a745;
}
.toggle-switch:hover::after {
transform: translateX(34px);
}
</div>
</section>
<!-- ====== 9. PRACTICAL: FADE-IN ====== -->
<section>
<h2>9. Practical Example: Fade-In</h2>
<p>Hover over each box to see it fade in and lift up.</p>
<div class="fade-container">
<div class="fade-box">Fade 1</div>
<div class="fade-box">Fade 2</div>
<div class="fade-box">Fade 3</div>
<div class="fade-box">Fade 4</div>
</div>
<div class="code-block">
.fade-box {
opacity: 0.3;
transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-box:hover {
opacity: 1;
transform: translateY(-10px);
}
</div>
</section>
<!-- ====== 10. REFERENCE TABLES ====== -->
<section>
<h2>10. Reference Tables</h2>
<h3>Transition Properties</h3>
<table class="reference-table">
<tr>
<th>Property</th>
<th>Description</th>
<th>Default</th>
</tr>
<tr>
<td><code>transition-property</code></td>
<td>Which property to animate</td>
<td><code>all</code></td>
</tr>
<tr>
<td><code>transition-duration</code></td>
<td>How long the transition takes</td>
<td><code>0s</code></td>
</tr>
<tr>
<td><code>transition-timing-function</code></td>
<td>Speed curve</td>
<td><code>ease</code></td>
</tr>
<tr>
<td><code>transition-delay</code></td>
<td>Wait before starting</td>
<td><code>0s</code></td>
</tr>
</table>
<h3>Timing Functions</h3>
<table class="reference-table">
<tr>
<th>Value</th>
<th>Description</th>
</tr>
<tr>
<td><code>ease</code></td>
<td>Slow start, fast middle, slow end (default)</td>
</tr>
<tr>
<td><code>linear</code></td>
<td>Constant speed</td>
</tr>
<tr>
<td><code>ease-in</code></td>
<td>Slow start, fast end</td>
</tr>
<tr>
<td><code>ease-out</code></td>
<td>Fast start, slow end</td>
</tr>
<tr>
<td><code>ease-in-out</code></td>
<td>Slow start, fast middle, slow end</td>
</tr>
<tr>
<td><code>cubic-bezier(n,n,n,n)</code></td>
<td>Custom speed curve</td>
</tr>
<tr>
<td><code>steps(n)</code></td>
<td>Stepped animation</td>
</tr>
</table>
<h3>Common Transition Examples</h3>
<table class="reference-table">
<tr>
<th>Example</th>
<th>Description</th>
</tr>
<tr>
<td><code>transition: all 0.3s ease;</code></td>
<td>All properties, 0.3s, ease</td>
</tr>
<tr>
<td><code>transition: background-color 0.5s;</code></td>
<td>Background only, 0.5s</td>
</tr>
<tr>
<td><code>transition: transform 0.3s ease-in-out 0.1s;</code></td>
<td>Transform, 0.3s, custom timing, 0.1s delay</td>
</tr>
<tr>
<td><code>transition: background-color 0.5s, transform 0.3s;</code></td>
<td>Multiple properties with different durations</td>
</tr>
</table>
<h3>Animatable Properties (Common)</h3>
<table class="reference-table">
<tr>
<th>Property</th>
<th>Notes</th>
</tr>
<tr>
<td><code>opacity</code></td>
<td>Hardware-accelerated, very smooth</td>
</tr>
<tr>
<td><code>transform</code></td>
<td>Hardware-accelerated, very smooth</td>
</tr>
<tr>
<td><code>background-color</code></td>
<td>Commonly used, works well</td>
</tr>
<tr>
<td><code>color</code></td>
<td>Works well for text</td>
</tr>
<tr>
<td><code>box-shadow</code></td>
<td>Can be expensive on large elements</td>
</tr>
<tr>
<td><code>border-radius</code></td>
<td>Works well</td>
</tr>
<tr>
<td><code>width</code>/<code>height</code></td>
<td>Can cause layout recalculation</td>
</tr>
</table>
</section>
<!-- ====== 11. BEST PRACTICES ====== -->
<section>
<h2>11. 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>transform</code> and <code>opacity</code> for the smoothest animations (hardware-accelerated)</li>
<li>Specify individual properties instead of <code>all</code> for better performance</li>
<li>Use short durations (0.2s–0.5s) for UI feedback</li>
<li>Use <code>ease</code> or <code>ease-in-out</code> for natural motion</li>
<li>Add transitions to hover, focus, and active states</li>
<li>Use <code>transition-delay</code> for staggered animations</li>
<li>Respect <code>prefers-reduced-motion</code> for accessibility</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 animate <code>width</code>, <code>height</code>, <code>top</code>, or <code>left</code> (causes layout recalculation)</li>
<li>Don't use long durations (> 1s) for UI feedback</li>
<li>Don't forget to add <code>transition</code> to the base state (not just hover)</li>
<li>Don't animate too many properties at once</li>
<li>Don't use <code>transition: all</code> for everything</li>
<li>Don't forget about <code>prefers-reduced-motion</code></li>
</ul>
</div>
<div class="code-block">
/* Accessibility: respect reduced motion */
@media (prefers-reduced-motion: reduce) {
.transition-box,
.btn-transition,
.card-transition {
transition: none;
}
}
/* Better performance: use transform instead of top/left */
.box {
transition: transform 0.3s ease;
}
.box:hover {
transform: translateY(-5px); /* Better than top: -5px */
}
</div>
</section>
</body>
</html>Quick Reference
| Property | Description | Default |
|---|---|---|
transition-property | Which property to animate | all |
transition-duration | How long the transition takes | 0s |
transition-timing-function | Speed curve | ease |
transition-delay | Wait before starting | 0s |
Timing Functions
| Value | Description |
|---|---|
ease | Slow start, fast middle, slow end (default) |
linear | Constant speed |
ease-in | Slow start, fast end |
ease-out | Fast start, slow end |
ease-in-out | Slow start, fast middle, slow end |
cubic-bezier(n,n,n,n) | Custom speed curve |
Common Transition Examples
| Example | Description |
|---|---|
transition: all 0.3s ease; | All properties, 0.3s, ease |
transition: background-color 0.5s; | Background only, 0.5s |
transition: transform 0.3s ease-in-out 0.1s; | Transform, 0.3s, custom timing, 0.1s delay |
transition: background-color 0.5s, transform 0.3s; | Multiple properties |
Best Practices
✅ Do This:
/* Smooth hover effect */
.box {
transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.box:hover {
transform: translateY(-5px);
box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}
/* Button feedback */
.btn {
transition: all 0.2s ease;
}
.btn:hover {
background: #0056b3;
}
.btn:active {
transform: scale(0.98);
}
/* Staggered animation */
.item:nth-child(1) { transition-delay: 0s; }
.item:nth-child(2) { transition-delay: 0.1s; }
.item:nth-child(3) { transition-delay: 0.2s; }
/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
.box {
transition: none;
}
}❌ Don’t Do This:
/* Don't animate layout properties */
.box {
transition: width 0.3s, height 0.3s; /* Causes layout recalculation */
}
/* Don't forget the base transition */
.box:hover {
transition: all 0.3s; /* Too late — transition won't work on mouse-out */
}
/* Don't use excessively long durations */
.box {
transition: all 3s; /* Too slow for UI */
}
/* Don't use transition: all for everything */
.box {
transition: all 0.5s; /* Can cause unexpected animations */
}Pro Tip: Transitions are the key to polished, interactive interfaces. Use transform and opacity for the smoothest animations (they’re hardware-accelerated). Keep durations short — 0.2s–0.5s for UI feedback. Always apply the transition to the base state, not just the hover state, so it works on both mouse-in and mouse-out. Use prefers-reduced-motion to respect users who are sensitive to animation. And remember: less is more — a few well-placed transitions are better than animating everything!
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