#main-content{background-color:#FFFFE3}a{text-decoration:none;color:#000080;font-weight:700;position:relative}a::before{content:'';background-color:#efbf04;position:absolute;left:0;bottom:3px;width:100%;height:8px;z-index:-1;transition:all .3s ease-in-out}a:hover::before{bottom:0;height:100%}