//css样式
.select_box{
    width:45%;
    height:70%;
    border-radius: 14rpx;
    position: relative;
  }
  .select_box .select{
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    border-radius: 8rpx;
    display: flex;
    align-items: center;
    padding: 0 10rpx;
  }
  .select_box .select .select_text{
    font-size: 26rpx;
    color: #777777;
    line-height: 28rpx;
    flex: 1;
  }
  .select_box .select .select_img{
    width: 30rpx;
    height: 30rpx;
    display: block;
    transition:transform 0.3s;
  }
  .select_box .select .select_img_rotate{
    transform:rotate(180deg); 
  }
  .select_box .option_box{
    position: absolute;
    top: calc(100% - 1px);
    width: 100%;
    box-sizing: border-box;
    height: 0;
    overflow-y: auto;
    background: #fff;
    transition: height 0.3s;
    border-left:1px solid #efefef;
    border-right:1px solid #efefef;
  }
  .select_box .option_box .option{
    display: block;
    line-height: 30rpx; 
    font-size: 26rpx;
    border-top: 1px solid #efefef;
    border-bottom: 1px solid #efefef;
    padding: 10rpx;
  }