.pa-underline-from-center nav ul li a{position:relative;overflow:hidden;transition:all 0.3s;-webkit-transition:all 0.3s;-moz-transition:all 0.3s;-o-transition:all 0.3s}.pa-underline-from-center nav ul li a::before{content:"";position:absolute;z-index:2;left:51%;right:51%;bottom:0;background:#ff0000;height:2px;-webkit-transition:all 0.3s ease-out;-moz-transition:all 0.3s ease-out;-o-transition:all 0.3s ease-out}.pa-underline-from-center nav ul li a:hover::before{left:0;right:0}