header { width: 100%; height: 115px; float: left; box-shadow: 0px 0px 5px 0px #6C6C6C;}

nav { width: 100%; height: 40px; float: left; background-color: #006cc8; }

.content_all_box { width: 100%; height: auto; float: left; margin-bottom: 55px; }

.content { width: 960px; height: auto; margin-left: auto; margin-right: auto; }

footer { width: 100%; height: 108px; float: left; margin-top: -30px;}