header{background-color:transparent;transition:background-color .4s ease}header.active{background-color:rgba(91,115,232,.85)}header .navbar-nav .nav-item{font-size:16px;font-weight:400;overflow:hidden}header .navbar-nav .nav-item:after{transition:all .3s ease;content:"";height:2px;border-radius:2px;display:block;background-color:#fff;position:relative;right:100%}header .navbar-nav .nav-item.active:after,header .navbar-nav .nav-item:hover:after{right:0}header .btn-group a:hover{background-color:transparent;opacity:.6}@media only screen and (max-width:991px){header:not(.active) .navbar-collapse{background:rgba(0,0,0,.4);border-radius:4px}}