on hover navbar show border code example
Example 1: css using border top border bottom to create a hamburger icon
.menu-toggle.on {
border-top-color:#ff0;
border-bottom-color:#ff0
}
.nav-toggle.on:before {
border-top-color:#ff0;
}
Example 2: css using border top border bottom to create a hamburger icon
<a class="menu-toggle">Menu</div>