.site-nav__dropdown { display: block; transition: 1s; -ms-transition: 1s; -o-transition: 1s; -moz-transition: 1s; visibility: hidden; opacity: 0; } .site-nav--has-dropdown:hover .site-nav__dropdown { visibility: visible; opacity: 1; } .announcement-bar__message { position: relative; } .announcement-bar__message:before { content: ""; position: absolute; width: 100%; height: 0; bottom: 0; left: 0; background-color: #FFF; visibility: hidden; transition: all 0.3s ease-in-out; } .announcement-bar__message:hover:before { visibility: visible; height: 1px; } .announcement-bar__message:hover { text-decoration: none; }