相关代码： <style type="text/css">
           /*补充代码*/
           .p1,.p2,.p3{
            /* 并集选择器 */
            text-indent: 2em;
            font-family: "微软雅黑";
        }
        .p1{
            color: orange;
            line-height: 20px;
        }
        .p2{
            color: green;
            line-height: 1.5em;
        }
        .p3{
            color: red;
            line-height: 200%;
        }

        </style>