body {
    margin: 0;
    padding: 0;
    height: 100%;
  }
  html{
    height: 100% !important;
  }

  #app {
    background: url("/assets/img/bg_img_PC4.png") no-repeat;
    background-size: cover;
    height: 100%;
    width: 100%;
    font-family: "PingFangSC-Medium";
    overflow-y: scroll;
  }
  
  .flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .fix-bottom{
    position: fixed;
    bottom: 40px;
    width: 100%;
    z-index: 1000;
  }

  /*  适配小屏幕 */
  @media screen and (max-width: 600px) {
    #app {
      background: url("/assets/img/bg_img_phone4@2x.png") no-repeat;
      height: 100%;
      width: 100%;
      background-size: cover;
      position: fixed;
      font-family: "PingFangSC-Medium";
    }
    .fix-bottom{
      position: fixed;
      bottom: 34px;
      width: 100%;
      z-index: 1000;
    }
  }