.hero-unit { padding:60px; margin-top: 60px; background: url("../img/bar2.jpg") no-repeat scroll 0; height:233px; width:100%; left:0px; background-size: cover; position:absolute; background-color:#eeeeee; }
-webkit-Box-sizing: border-Box; /* Safari/Chrome,other WebKit */ -moz-Box-sizing: border-Box; /* Firefox,other Gecko */ Box-sizing: border-Box;
这使得当您添加填充,边距或边框时,它不会影响宽度. (这不适用于IE7及以下版本)
