Enlarges the bottom border on :hover
/* Effect 4: bottom border enlarge */
.cl-effect-4 a {
padding: 0 0 10px;
}
.cl-effect-4 a::after {
position: absolute;
top: 100%;
left: 0;
width: 100%;
height: 1px;
background: #fff;
content: '';
opacity: 0;
-webkit-transition: height 0.3s, opacity 0.3s, -webkit-transform 0.3s;
-moz-transition: height 0.3s, opacity 0.3s, -moz-transform 0.3s;
transition: height 0.3s, opacity 0.3s, transform 0.3s;
-webkit-transform: translateY(-10px);
-moz-transform: translateY(-10px);
transform: translateY(-10px);
}
.cl-effect-4 a:hover::after,
.cl-effect-4 a:focus::after {
height: 5px;
opacity: 1;
-webkit-transform: translateY(0px);
-moz-transform: translateY(0px);
transform: translateY(0px);
}