DOCTYPE html> Document html,body{ margin:0px; } header{ height:100px; border:5px solid red; } nav{ height: 30px; border:5px solid orange; margin:70px 0 0 0; } nav ul{ display:flex; list-style: none; margin:0px; } section{ height: 500px; border:5px solid green; /*width:90%;*/ } aside{ height: 500px; width: 100px; border:5px solid blue; } .flex_box{ display: flex; } footer{ height: 100px; border:5..
