index.css

* {
    margin: 0;
    padding: 0;
  }

  .cut {
    width: 500px;
    height: 500px;
    margin: 30px auto;
  }

  .c-item {
    max-width: 800px;
    margin: 10px auto;
    margin-top: 20px;
  }

  .content {
    margin: auto;
    max-width: 1200px;
    margin-bottom: 100px;
  }

  .test-button {
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
  }

  .btn {
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    background: #fff;
    border: 1px solid #c0ccda;
    color: #1f2d3d;
    text-align: center;
    box-sizing: border-box;
    outline: none;
    margin:20px 10px 0px 0px;
    padding: 9px 15px;
    font-size: 14px;
    border-radius: 4px;
    color: #fff;
    background-color: #50bfff;
    border-color: #50bfff;
    transition: all .2s ease;
    text-decoration: none;
    user-select: none;
  }

  .des {
    line-height: 30px;
  }

  code.language-html {
    padding: 10px 20px;
    margin: 10px 0px;
    display: block;
    background-color: #333;
    color: #fff;
    overflow-x: auto;
    font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo, Lucida, Sans, Type, Writer, Ubuntu, Mono;
    border-radius: 5px;
    white-space: pre;
  }

  .show-info {
    margin-bottom: 50px;
  }

  .show-info h2 {
    line-height: 50px;
  }

  /*.title, .title:hover, .title-focus, .title:visited {
    color: black;
  }*/

  .title {
    display: block;
    text-decoration: none;
    text-align: center;
    line-height: 1.5;
    margin: 20px 0px;
    background-image: -webkit-linear-gradient(left,#3498db,#f47920 10%,#d71345 20%,#f7acbc 30%,#ffd400 40%,#3498db 50%,#f47920 60%,#d71345 70%,#f7acbc 80%,#ffd400 90%,#3498db);
    color: transparent;
    -webkit-background-clip: text;
    background-size: 200% 100%;
    animation: slide 5s infinite linear;
    font-size: 40px;
  }

  .test {
    height: 500px;
  }

  .model {
    position: fixed;
    z-index: 10;
    width: 100vw;
    height: 100vh;
    overflow: auto;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.8);
  }

  .model-show {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
  }

  .model img {
    display: block;
    margin: auto;
    max-width: 80%;
    user-select: none;
    background-position: 0px 0px, 10px 10px;
    background-size: 20px 20px;
    background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
  }

  .c-item {
    display: block;
    user-select: none;
  }

  @keyframes slide {
    0%  {
      background-position: 0 0;
    }
    100% {
      background-position: -100% 0;
    }
  }