*{
    /* 初始化 */
    margin: 0;
    padding: 0;
  }
  body{
    /* 100%窗口高度 */
    height: 100vh;
    /* 弹性布局 居中 */
    display: flex;
    justify-content: center;
    align-items: center;
    /* 渐变背景 */
    background: linear-gradient(200deg,#e3c5eb,#a9c1ed);
    /* 溢出隐藏 */
    overflow: hidden;
  }
  .container{
    /* 相对定位 */
    position: relative;
    z-index: 1;
    background-color: #fff;
    border-radius: 15px;
    /* 弹性布局 垂直排列 */
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 350px;
    height: 500px;
    /* 阴影 */
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
  }
  .container .tit{
    font-size: 26px;
    margin: 65px auto 70px auto;
  }
  .container input{
    width: 280px;
    height: 30px;
    text-indent: 8px;
    border: none;
    border-bottom: 1px solid #ddd;
    outline: none;
    margin: 12px auto;
  }
  .container button{
    width: 280px;
    height: 40px;
    margin: 35px auto 40px auto;
    border: none;
    background: linear-gradient(-200deg,#fac0e7,#aac2ee);
    color: #fff;
    font-weight: bold;
    letter-spacing: 8px;
    border-radius: 10px;
    cursor: pointer;
    /* 动画过渡 */
    transition: 0.5s;
  }
  .container button:hover{
    background: linear-gradient(-200deg,#aac2ee,#fac0e7);
    background-position-x: -280px;
  }
  .container span{
    font-size: 14px;
  }
  .container a{
    color: plum;
    text-decoration: none;
  }
  ul li{
    position: absolute;
    border: 1px solid #fff;
    background-color: #fff;
    width: 30px;
    height: 30px;
    list-style: none;
    opacity: 0;
  }
  .square li{
    top: 40vh;
    left: 60vw;
    /* 执行动画：动画名 时长 线性的 无限次播放 */
    animation: square 10s linear infinite;
  }
  .square li:nth-child(2){
    top: 80vh;
    left: 10vw;
    /* 设置动画延迟时间 */
    animation-delay: 2s;
  }
  .square li:nth-child(3){
    top: 80vh;
    left: 85vw;
    /* 设置动画延迟时间 */
    animation-delay: 4s;
  }
  .square li:nth-child(4){
    top: 10vh;
    left: 70vw;
    /* 设置动画延迟时间 */
    animation-delay: 6s;
  }
  .square li:nth-child(5){
    top: 10vh;
    left: 10vw;
    /* 设置动画延迟时间 */
    animation-delay: 8s;
  }
  .circle li{
    bottom: 0;
    left: 15vw;
    /* 执行动画 */
    animation: circle 10s linear infinite;
  }
  .circle li:nth-child(2){
    left: 35vw;
    /* 设置动画延迟时间 */
    animation-delay: 2s;
  }
  .circle li:nth-child(3){
    left: 55vw;
    /* 设置动画延迟时间 */
    animation-delay: 6s;
  }
  .circle li:nth-child(4){
    left: 75vw;
    /* 设置动画延迟时间 */
    animation-delay: 4s;
  }
  .circle li:nth-child(5){
    left: 90vw;
    /* 设置动画延迟时间 */
    animation-delay: 8s;
  }
  
  /* 定义动画 */
  @keyframes square {
    0%{
        transform: scale(0) rotateY(0deg);
        opacity: 1;
    }
    100%{
        transform: scale(5) rotateY(1000deg);
        opacity: 0;
    }
  }
  @keyframes circle {
    0%{
        transform: scale(0) rotateY(0deg);
        opacity: 1;
        bottom: 0;
        border-radius: 0;
    }
    100%{
        transform: scale(5) rotateY(1000deg);
        opacity: 0;
        bottom: 90vh;
        border-radius: 50%;
    }
  }