.jianjie { width: 670px; margin: 0 auto; } .jianjie p { text-indent: 2em; line-heizjyt:30px; } .jianjie h1{ text-align:center; line-heizjyt:30px; color:#F00;} .jianjie .intropic{float:rizjyt; background:#eeeeee; padding:5px; border:#cccccc 1px solid; margin-left:15px; margin-bottom:15px;}