SOURCE

<div id="app">
    <div class="liang-login">
        <div class="liang-login--layer">
            <ul class="circles">
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
        </div>
        <div class="liang-login--layer">
            <div class="liang-login--content-header">
                <p>时间是一切财富中最宝贵的财富。</p>
            </div>
            <div class="liang-login--content-main">
                  
            </div>
        </div>
    </div>
</div>

 body #app,html #app {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0
    }

    body,html {
        margin: 0;
        height: 100%;
        font-family: Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,Microsoft YaHei,"\5FAE\8F6F\96C5\9ED1",Arial,sans-serif
    }



  .liang-login {
    background-color: #f0f2f5;
    height: 100%;
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    cursor: pointer;
  }

  .liang-login .liang-login--layer {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow: hidden;
  }


  .liang-login .circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
  }

  .liang-login .circles li {
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: #fff;
    -webkit-animation: animate 25s linear infinite;
    animation: animate 25s linear infinite;
    bottom: -200px;
  }

  @-webkit-keyframes animate {
    0% {
      -webkit-transform: translateY(0) rotate(0deg);
      transform: translateY(0) rotate(0deg);
      opacity: 1;
      border-radius: 0;
    }

    to {
      -webkit-transform: translateY(-1000px) rotate(2turn);
      transform: translateY(-1000px) rotate(2turn);
      opacity: 0;
      border-radius: 50%;
    }
  }

  @keyframes animate {
    0% {
      -webkit-transform: translateY(0) rotate(0deg);
      transform: translateY(0) rotate(0deg);
      opacity: 1;
      border-radius: 0;
    }

    to {
      -webkit-transform: translateY(-1000px) rotate(2turn);
      transform: translateY(-1000px) rotate(2turn);
      opacity: 0;
      border-radius: 50%;
    }
  }

  .liang-login .circles li:first-child {
    left: 15%;
    width: 80px;
    height: 80px;
    -webkit-animation-delay: 0s;
    animation-delay: 0s;
  }

  .liang-login .circles li:nth-child(2) {
    left: 5%;
    width: 20px;
    height: 20px;
    -webkit-animation-delay: 2s;
    animation-delay: 2s;
    -webkit-animation-duration: 12s;
    animation-duration: 12s
  }

  .liang-login .circles li:nth-child(3) {
    left: 70%;
    width: 20px;
    height: 20px;
    -webkit-animation-delay: 4s;
    animation-delay: 4s;
  }

  .liang-login .circles li:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 60px;
    -webkit-animation-delay: 0s;
    animation-delay: 0s;
    -webkit-animation-duration: 18s;
    animation-duration: 18s;
  }

  .liang-login .circles li:nth-child(5) {
    left: 65%;
    width: 20px;
    height: 20px;
    -webkit-animation-delay: 0s;
    animation-delay: 0s;
  }

  .liang-login .circles li:nth-child(6) {
    left: 75%;
    width: 150px;
    height: 150px;
    -webkit-animation-delay: 3s;
    animation-delay: 3s;
  }

  .liang-login .circles li:nth-child(7) {
    left: 35%;
    width: 200px;
    height: 200px;
    -webkit-animation-delay: 7s;
    animation-delay: 7s;
  }

  .liang-login .circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 25px;
    -webkit-animation-delay: 15s;
    animation-delay: 15s;
    -webkit-animation-duration: 45s;
    animation-duration: 45s;
  }

  .liang-login .circles li:nth-child(9) {
    left: 20%;
    width: 15px;
    height: 15px;
    -webkit-animation-delay: 2s;
    animation-delay: 2s;
    -webkit-animation-duration: 35s;
    animation-duration: 35s;
  }

  .liang-login .circles li:nth-child(10) {
    left: 85%;
    width: 150px;
    height: 150px;
    -webkit-animation-delay: 0s;
    animation-delay: 0s;
    -webkit-animation-duration: 11s;
    animation-duration: 11s;
  }


  .liang-login--content-header {
    padding: 1em 0;
  }

  .liang-login--content-header p {
    margin: 0;
    color: #606266;
    text-align: center;
    font-size: 12px;
  }

  .liang-login--content-main {
    display: flex;
    height: 100%;
    justify-content: center;
    align-items: center;
  }

  .liang-login--form {
    width: 320px;
  }