ul {
overflow:hidden;
position:relative;
list-style:none;
}
ul li {
float:left;
padding:10px 20px;
background:#ccc;
color:#fff;
font-size:20px;
cursor:pointer;
transition:all .2s linear;
}
ul span {
display:block;
width:100%;
height:2px;
background:#f60;
position:absolute;
bottom:0;
}
ul li:hover {
color:red;
}