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Perform Animation on CSS border-bottom-color property
The CSS border-bottom-color property can be animated to create smooth color transitions for the bottom border of an element. This property is animatable, allowing you to create engaging visual effects.
Syntax
selector {
border-bottom-color: color;
animation: animation-name duration timing-function;
}
@keyframes animation-name {
from { border-bottom-color: initial-color; }
to { border-bottom-color: final-color; }
}
Example: Animating Border Bottom Color
The following example demonstrates how to animate the border-bottom-color property from blue to red over a 2-second duration −
<!DOCTYPE html>
<html>
<head>
<style>
.animated-box {
width: 300px;
height: 150px;
background-color: #f0f0f0;
border: 5px solid transparent;
border-bottom: 5px solid blue;
animation: colorChange 2s infinite alternate;
display: flex;
align-items: center;
justify-content: center;
font-size: 18px;
font-weight: bold;
margin: 20px;
}
@keyframes colorChange {
0% {
border-bottom-color: blue;
}
100% {
border-bottom-color: red;
}
}
</style>
</head>
<body>
<h2>Border Bottom Color Animation</h2>
<div class="animated-box">Watch the bottom border!</div>
</body>
</html>
A gray box with centered text appears with a bottom border that smoothly transitions from blue to red and back repeatedly every 2 seconds.
Example: Multi-Color Transition
You can create more complex animations with multiple color stops using percentage keyframes −
<!DOCTYPE html>
<html>
<head>
<style>
.rainbow-border {
width: 400px;
height: 100px;
background-color: white;
border: 3px solid transparent;
border-bottom: 8px solid red;
animation: rainbow 3s infinite linear;
display: flex;
align-items: center;
justify-content: center;
font-size: 16px;
margin: 20px;
}
@keyframes rainbow {
0% { border-bottom-color: red; }
16.66% { border-bottom-color: orange; }
33.33% { border-bottom-color: yellow; }
50% { border-bottom-color: green; }
66.66% { border-bottom-color: blue; }
83.33% { border-bottom-color: indigo; }
100% { border-bottom-color: violet; }
}
</style>
</head>
<body>
<h2>Rainbow Bottom Border Animation</h2>
<div class="rainbow-border">Colorful Border Animation</div>
</body>
</html>
A white box with text displays a continuously cycling rainbow-colored bottom border that smoothly transitions through red, orange, yellow, green, blue, indigo, and violet.
Conclusion
The border-bottom-color property can be effectively animated using CSS keyframes to create smooth color transitions. Use percentage keyframes for multi-color effects and timing functions to control the animation pace.
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