Smooth changes between states.
✍️ 3 exercises + code challenge in this lessonA transition animates a property change smoothly instead of instantly, for example when hovering.
transition: property duration timing-function delay;
transition: background-color 0.3s ease;transition: all 0.4s; animates every property that changes.ease, linear, ease-in, ease-out, ease-in-out, cubic-bezier().Mastering CSS Transitions helps you write clean and reliable CSS code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<style>
.btn {
background: #2563EB; color: white; padding: 12px 24px; border: 0; border-radius: 10px; font-size: 16px;
transition: transform .25s ease, box-shadow .25s ease, background-color .25s;
}
.btn:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(37,99,235,.4); background: #1D4ED8; }
.bar { width: 60px; height: 20px; background: #14B8A6; margin-top: 20px; border-radius: 99px; transition: width 1s ease-in-out; }
.bar:hover { width: 300px; }
</style>
<button class="btn">Hover me</button>
<div class="bar"></div><small>Hover the bar</small>Check what you learned in “CSS Transitions”.
Animate background colour changes over 0.3 seconds.
button {
transition: 0.3s;
}
What does a transition do?
Give the button a transition of 0.5s.
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