.A3code {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  :global {
    #myVideo {
      width: 100%;
      height: 100%;
    }
    .A3tit {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      color: #fff;
      text-shadow: black 1px 1px;
    }
    .A3Back {
      position: absolute;
      top: 10px;
      right: 10px;
      background-color: rgba(0, 0, 0, 0.6);
      color: #fff;
      border-radius: 4px;
      text-align: center;
      height: 40px;
      line-height: 40px;
      width: 100px;
      font-size: 20px;
    }
    .aa {
      top: 100px;
    }

    // 错误
    .A3err {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #fff;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      font-size: 20px;

      .A3errNew {
        margin-top: 10%;
        background-color: rgba(0, 0, 0, 0.6);
        color: #fff;
        border-radius: 4px;
        text-align: center;
        height: 40px;
        line-height: 40px;
        width: 100px;
      }
    }
  }
}
