「HTML+CSS」--自定义加载动画【017】

<!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">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    <section><span></span></section>
</body>
</html>

html,body{
  margin: 0;
  height: 100%;
}
body{
  display: flex;
  justify-content: center;
  align-items: center;
  background: #263238;
}
section {
    width: 650px;
    height: 300px;
    padding: 10px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 红色边框仅作提示 */
    border: 2px solid red;
}

span{
  width : 96px;
  height: 96px;
  border: 5px solid ;
  border-color: white ;
  border-radius: 50%; 
  position: relative;
  display: flex;
  justify-content: center;
  animation: rotation 2s linear infinite;
}
span::before{
  position: relative;
  content: '';
  background: red;
  width:  3px;
  height:  48px;
}

@keyframes rotation {
  0% { transform: rotate(0deg) }
  100% { transform: rotate(360deg)
  }
}

 width : 96px;
  height: 96px;
  border: 5px solid ;
  border-color: white ;

  position: relative;
  content: '';
  background: red;
  width:  3px;
  height:  48px;

border-radius: 50%; 

 animation: rotation 2s linear infinite;

span::before{
  position: relative;
  content: '';
  background: red;
  width:  3px;
  height:  48px;
}