.content{margin-left:15%}.active{background-color:#4caf50;color:#fff}.men_menu_ul{list-style-type:none;margin:0;padding:0;width:15%;background-color:#f1f1f1;height:100%;position:fixed;overflow:auto}.men_menu_li a{display:block;color:#000;padding:8px 16px;text-decoration:none}.men_menu_li a:hover{background-color:#555;color:red}