css实现圆环效果

方法1

width: 200px;
height: 200px;
border: 100px solid black;
border-top-color: pink;
border-radius: 50%;

方法2

width: 300px;
height: 300px;
background: radial-gradient(transparent 130px, violet 0px);
border-radius: 50%;

方法1实例代码

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    body {
      background-color: tomato;
    }

    div {
      width: 200px;
      height: 200px;
      border: 100px solid black;
      border-top-color: pink;
      border-radius: 50%;
      animation: myani 5s linear infinite;
    }

    @keyframes myani {
      100% {
        transform: rotate(360deg);
      }
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

方法2实例代码

<!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>Document</title>
  <style>
    body {
      background-color: #179067;
    }

    .ring {
      width: 300px;
      height: 300px;
      background: radial-gradient(transparent 130px, violet 0px);
      border-radius: 50%;
      margin: auto;
      animation: myani 2s infinite;
    }

    @keyframes myani {
      0% {
        transform: scale(1);
      }

      50% {
        transform: scale(.1);
      }

      100% {
        transform: scale(1);
      }
    }
  </style>
</head>

<body>
  <div class="ring"></div>
</body>

</html>
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