.pa-underline-grow nav ul li a{position:relative}.pa-underline-grow nav ul li a::before{content:"";position:absolute;bottom:0;height:0;width:0;left:50%;opacity:0;background-color:#e02020;z-index:2;display:block;-webkit-transition:.3s;-o-transition:.3s;transition:.3s;-webkit-transition-timing-function:cubic-bezier(.58,.3,.005,1);-o-transition-timing-function:cubic-bezier(.58,.3,.005,1);transition-timing-function:cubic-bezier(.58,.3,.005,1)}.pa-underline-grow nav ul li a:hover::before{width:100%;left:0;opacity:1;height:2px}