humans/lufang.html

<!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>hello world</title>
  <style>
    body {
      width: 100vw;
      height: 100vh;
      font-family: courier, monospace;
      display: flex;
      justify-content: center;
      align-items: center;
      text-align: center;
      font-size: 13px;
      line-height: 1.65em;
      margin: 0;
      background-image: linear-gradient(45deg, #f3ffd9, #ffe4e4, #fffce6);
    }

    body:before {
      background-image: linear-gradient(300deg, #e9ffba, #f0f0f0, #ffeccf);
      animation: you infinite alternate 1s;
      content: '';
      display: block;
      position: absolute;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
      z-index: -1;
    }

    @keyframes you {
      0% {
        opacity: 0;
      }

      100% {
        opacity: 1;
      }
    }
  </style>
</head>

<body>
  <p>Hi, this is lufang.html.</p>
</body>

</html>