.nav-flipover {
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}
.nav-flipover::before,
.nav-flipover::after {
    display: table;
    content: " ";
}
.nav-flipover > li {
    position: relative;
    display: block;
	float: left;
}
.nav-flipover > li > a {
    position: relative;
    display: block;
	width: 100px;
	height: 40px;
	line-height: 40px;
	text-align: center;
	transform-style: preserve-3d;
	transition: all .6s;
}
.nav-flipover > li > a:hover {
	text-decoration: none;
	transform: rotateX(90deg);
}
.nav-flipover > li > a::before,
.nav-flipover > li > a::after {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}
.nav-flipover > li > a::before {
	content: attr(data-title);
	transform: translateZ(20px);
	box-shadow: 0 -5px 15px -5px rgba(0,0,0,.3);
	background: lightsteelblue;
	color: #fff;
}
.nav-flipover > li > a::after {
	content: attr(data-content);
	transform: rotateX(-90deg) translateZ(20px);
	box-shadow: 0 5px 15px -5px rgba(0,0,0,.3);
	background: powderblue;
	color: #fff;
}
.nav-flipover > li.active > a::before {
	background: steelblue;
}