index.scss

#problems {
  height: 100%;
  padding: 58px 0 54px;
  overflow-x: hidden;

  .detail-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
  }

  .topic {
    padding: 0 13px;
    white-space: pre-wrap;
    font-size: 16px;
    color: #555;
  }

  .btn {
    position: relative;
    margin-top: 21px;

    button {
      position: absolute;
      right: 0;
      top: 0;
      font-size: 12px;
      color: #09f;
      -webkit-appearance: none;
      outline: 0;
      border: 0;
      background-color: transparent;
    }

    .iconfont {
      font-size: 14px;
    }
  }

  .content {
    margin-top: 16px;
    padding: 15px 13px;
    background-color: #F5F5F5;
    font-size: 16px;
    color: #333;
    white-space: pre-wrap;
    word-break: break-all;

    .title {
      margin-bottom: 5px;
      color: #999;
      font-size: 14px;
    }
  }

  footer {
    position: fixed;
    bottom: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: 44px;
    padding: 0 12px 0 15px;
    border-top: 1px solid #DDD;
    background-color: #fff;
    font-size: 12px;
    color: #09f;

    .app {
      display: flex;
      color: #666;

      div {
        margin-left: 5px;
        color: #09f;
      }
    }

    .nav {
      display: inline-block;
      width: 60px;
      height: 22px;
      line-height: 22px;
      border: 1px solid rgba(0, 153, 255, 1);
      border-radius: 11px;
      text-align: center;

      &:nth-child(1) {
        margin-right: 20px;
      }
    }
  }

  .captcha-container{
    width: 80%;
    padding-top: 50%;
    margin: 0 auto;
    text-align: center;
    font-size: 20px;
    div:nth-child(1){
      margin-bottom: 10px;
    }
  }
}

@keyframes slideInDown {
  from {
    transform: translate3d(0, -10%, 0);
  }

  to {
    transform: translate3d(0, 0, 0);
    visibility: visible;
  }
}

.slideInDown {
  animation: slideInDown .3s both;
}