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Animate border-color property with CSS
The CSS border-color property can be animated to create dynamic color transitions on element borders. This animation effect is useful for hover states, attention-grabbing elements, or interactive UI components.
Syntax
selector {
animation: animation-name duration timing-function iteration-count;
}
@keyframes animation-name {
percentage {
border-color: color-value;
}
}
Example: Basic Border Color Animation
The following example animates the border color from gray to red and back −
<!DOCTYPE html>
<html>
<head>
<style>
.animated-border {
width: 300px;
height: 150px;
background-color: #f0f0f0;
border: 5px solid gray;
animation: colorChange 2s infinite alternate;
display: flex;
align-items: center;
justify-content: center;
font-family: Arial, sans-serif;
margin: 20px auto;
}
@keyframes colorChange {
0% {
border-color: gray;
}
50% {
border-color: red;
}
100% {
border-color: blue;
}
}
</style>
</head>
<body>
<h2>Border Color Animation</h2>
<div class="animated-border">Animated Border</div>
</body>
</html>
A rectangular box with centered text appears, and its border color smoothly transitions from gray to red to blue and back repeatedly.
Example: Multiple Border Colors
This example demonstrates animating through multiple colors with different timing −
<!DOCTYPE html>
<html>
<head>
<style>
.rainbow-border {
width: 250px;
height: 100px;
background-color: white;
border: 8px solid red;
animation: rainbowBorder 3s infinite linear;
margin: 30px auto;
border-radius: 10px;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
color: #333;
}
@keyframes rainbowBorder {
0% { border-color: red; }
16.66% { border-color: orange; }
33.33% { border-color: yellow; }
50% { border-color: green; }
66.66% { border-color: blue; }
83.33% { border-color: indigo; }
100% { border-color: violet; }
}
</style>
</head>
<body>
<h2>Rainbow Border Animation</h2>
<div class="rainbow-border">Rainbow Effect</div>
</body>
</html>
A rounded rectangular box with bold text displays a continuously cycling rainbow border effect, smoothly transitioning through red, orange, yellow, green, blue, indigo, and violet colors.
Conclusion
Animating the border-color property creates engaging visual effects for web elements. Use keyframes to define color transitions and control timing with animation properties for smooth, eye-catching border animations.
Updated on: 2026-03-15T13:25:10+05:30
907 Views
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