纯CSS实现选中商品后右下角显示√号功能

 &.selected{
              color: @theme;
              border: 0.02rem solid @theme;
              position: relative;
              transition: all 0.5s ease;
            }
            &.selected::after {
              content: '✔';
              display: block;
              height: 0px;
              width: 0px;
              position: absolute;
              bottom: 0;
              right: 0;
              color:#fff;
              /对号大小/
              font-size: 10px;
              line-height: 8px;
              border: 10px solid;
              border-color: transparent #4884ff #4884ff transparent;
            }