css 蛇型边框 

<!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>
posted @ 2023-03-20 10:24  7c89  阅读(42)  评论(0)    收藏  举报