cross-menu.css

body{
	margin: 0;
	padding: 0;
	background-color: #000;
	font-family: sans-serif;
}

ul{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	display: flex;
	margin: 0;
	padding: 0;
}

ul li{
	list-style: none;
}

ul li a{
	position: relative;
	display: block;
	padding: 10px;
	margin: 0 10px;
	text-decoration: none;
	text-transform: uppercase;
	color: #fff;
	transition: .5s;
}

ul li a:before{
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	height: 100%;
	width: 100%;
	border-left: 2px solid #ed192d;	
	border-top: 2px solid #ed192d;
	transform-origin: left;
	transition: .5s;
	box-sizing: border-box;
}

ul li a:hover:before{
	width: 10px;
	height: 10px;
}

ul li a:after{
	content: "";
	position: absolute;
	bottom: 0;
	right: 0;
	height: 100%;
	width: 100%;
	border-bottom: 2px solid #ed192d;
	border-right: 2px solid #ed192d;
	transform-origin: left;
	transition: .5s;
	box-sizing: border-box;
}

ul li a:hover:after{
	width: 10px;
	height: 10px;
	transform: rotate(-360deg);
	transition-delay: .3s;
}