<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>蛇形边框</title>
<link rel="stylesheet" type="text/css" href="index.css">
</head>
<body>
<div class="conic"></div>
<div class="conic conic-demo"></div>
<style>
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background: #000;
}
*,
*::before,
*::after {
box-sizing: border-box;
}
@-webkit-keyframes rotate {
100% {
transform: rotate(1turn);
}
}
@keyframes rotate {
100% {
transform: rotate(1turn);
}
}
.conic {
position: relative;
z-index: 0;
width: 400px;
height: 300px;
margin: 20px;
border: 1px solid #ccc;
border-radius: 10px;
overflow: hidden;
padding: 2rem;
}
.conic::before {
content: "";
position: absolute;
z-index: -2;
left: -50%;
top: -50%;
width: 200%;
height: 200%;
background-color: #000;
background-repeat: no-repeat;
background-position: 0 0;
background-image: conic-gradient(transparent, #a8efff, transparent 10%);
-webkit-animation: rotate 4s linear infinite;
animation: rotate 4s linear infinite;
}
.conic::after {
content: "";
position: absolute;
z-index: -1;
left: 6px;
top: 6px;
width: calc(100% - 12px);
height: calc(100% - 12px);
background: #000;
border-radius: 5px;
}
.conic-demo::after {
-webkit-animation: opacityChange 5s infinite linear;
animation: opacityChange 5s infinite linear;
}
@-webkit-keyframes opacityChange {
50% {
opacity: 0.5;
}
100% {
opacity: 1;
}
}
@keyframes opacityChange {
50% {
opacity: 0.5;
}
100% {
opacity: 1;
}
}
</style>
</body>
</html>
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