.plc{ display:block;}

.allcontent{ border:3px solid #f3f3f3;  box-shadow: 0 0 6px #ccc;  margin-bottom: 35px;padding:44px; width:1100px; overflow:hidden;}
.allcontent h4 {  padding:0px 0 10px; color: #555; font: 20px/63px "Microsoft Yahei"; font-weight:bold;  font-size: 22px; line-height: 40px;  margin-bottom: 0px; text-align: center;}