1、实现效果
2、实现代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
@import url('https://fonts.googleapis.com/css?family=Raleway:200');
html,
body {
height: 100%;
}
body {
display: flex;
justify-content: center;
align-items: center;
height: 100%;
background: #1D1F20;
}
#box {
display: flex;
justify-content: center;
align-items: center;
width: 400px;
height: 200px;
color: #fff;
font-size: 2.5rem;
}
.gradient-border {
--borderWidth: 3px;
background: #1D1F20;
position: relative;
border-radius: var(--borderWidth);
}
.gradient-border:after {
content: '';
position: absolute;
top: calc(-1 * var(--borderWidth));
left: calc(-1 * var(--borderWidth));
height: calc(100% + var(--borderWidth) * 2);
width: calc(100% + var(--borderWidth) * 2);
background: linear-gradient(60deg, #f79533, #f37055, #ef4e7b, #a166ab, #5073b8, #1098ad, #07b39b, #6fba82);
border-radius: calc(2 * var(--borderWidth));
z-index: -1;
animation: animatedgradient 3s ease alternate infinite;
background-size: 300% 300%;
}
@keyframes animatedgradient {
0% {
background-position: 0% 50%;
}
50% {
background-position: 100% 50%;
}
100% {
background-position: 0% 50%;
}
}
</style>
</head>
<body>
<div class="gradient-border" id="box">
Animated <br>CSS <br>Gradient Border
</div>
</body>
</html>