main{max-width:510px;margin:0 auto;padding:38px 20px}h1{font-size:40px}.intro{font-size:13px;margin-bottom:24px}#submit{width:100%;margin-top:15px;cursor:pointer}#result{font-size:13px;line-height:1.6}.foot{font-size:11px;color:#7a887a;line-height:1.6}iframe{min-height:530px}