关于流动版面的问题_html/css_WEB-ITnose:body{ width:90%; margin:0 auto} #content{ overflow:auto; height:100%;} #nav,#feature,#footer{ background-color:#efefef; margin:1%;} .col1.col2.col3{ background-color:#efefef; width:31.3%px; float:left; margin:1%;} li{ display:inline; padd