:root{--BottomOffset:20px;--LineHeight:1px;--LineColor:#3B1347}.nav li>a{position:relative;z-index:1}.nav li>a:before{position:absolute;content:'';display:block;z-index:-1;background:var(--LineColor);width:0;height:var(--LineHeight);bottom:var(--BottomOffset);border-radius:var(--LineHeight);left:50%;transition:0.4s cubic-bezier(0.25,0.1,0,2.02)}.nav li>a:hover:before{width:calc(100% + var(--LineHeight));left:calc(var(--LineHeight) / -2)}