navigation-menu.css

.header_nav .nav_item {
	position: relative;
	margin-right: 15px;
	display: inline-block;
}

.header_nav .nav_item:last-child {
	margin-right: 0;
}

.header_nav .nav_item a {
	position: relative;
}

.header_nav .nav_item a:before {
	content: '';
	height: 4px;
	width: 0;
	position: absolute;
	bottom: -4px;
	background-color: #62cbe9;
	transition: width 0.3s;
}

.header_nav .nav_item a:hover:before {
	width: 100%;
}

.header_nav .nav_item .item_name {
	cursor: default;
}

.header_nav .item_dropdawn {
	display: none;
	width: 210px;
	padding: 20px 10px;
	margin: 0;
	/*opacity: 0;*/
	position: absolute;
	top: 100%;
	left: 0;
	text-align: left;
	transition: opacity 0.3s;
	background: rgba(98, 205, 233, 0.7);
}

.header_nav .nav_item:hover .item_dropdawn {
	display: block;
	/*opacity: 1;*/
}

.header_nav .item_dropdawn .dropdawn_item {
	color: #fff;
	margin-bottom: 10px;
}

.header_nav .item_dropdawn .dropdawn_item:last-child {
	margin-bottom: 0;
}

.header_nav .item_dropdawn .dropdawn_item a:before {
	background-color: #fff;
}

#humburger-icon {
	display: none;
}

@media only screen and (max-width: 1200px) {
	.header_nav {
		opacity: 0;
		width: 100%;
		margin: 0;
		position: fixed;
		top: 0;
		bottom: 0;
		left: 0;
		right: 0;
		z-index: -1;
		text-align: center;
		background: rgba(50, 50, 50, 0.9);
	}
	.header_nav > ul {
		position: absolute;
		width: 500px;
		top: 50%;
		left: 50%;
		transform: translate(-50%, -50%);
	}
	.header_nav .nav_item {
		display: block;
		margin-right: 0;
		margin-bottom: 30px;
		color: #fff;
	}
	.header_nav .nav_item:last-child {
		margin-bottom: 0;
	}
	.header_nav .item_dropdawn {
		position: static;
		display: none;
		margin: auto;
		text-align: center;
	}
	#humburger-icon {
		display: block;
	}
	#humburger-icon.open {
		z-index: 2;
	}
}


/* ===========================
 * ANIMATIONS
** =========================== */

#humburger-icon {
	width: 35px;
	height: 45px;
	position: absolute;
	bottom: -20px;
	right: 15px;
	margin: 50px auto;
	-webkit-transform: rotate(0deg);
	-moz-transform: rotate(0deg);
	-o-transform: rotate(0deg);
	transform: rotate(0deg);
	-webkit-transition: .5s ease-in-out;
	-moz-transition: .5s ease-in-out;
	-o-transition: .5s ease-in-out;
	transition: .5s ease-in-out;
	cursor: pointer;
}

#humburger-icon span {
	display: block;
	position: absolute;
	height: 6px;
	width: 100%;
	background: #62cbe9;
	border-radius: 9px;
	opacity: 1;
	left: 0;
	-webkit-transform: rotate(0deg);
	-moz-transform: rotate(0deg);
	-o-transform: rotate(0deg);
	transform: rotate(0deg);
	-webkit-transition: .25s ease-in-out;
	-moz-transition: .25s ease-in-out;
	-o-transition: .25s ease-in-out;
	transition: .25s ease-in-out;
}

/* Icon 3 */

#humburger-icon span:nth-child(1) {
	top: 0px;
}

#humburger-icon span:nth-child(2),#humburger-icon span:nth-child(3) {
	top: 9px;
}

#humburger-icon span:nth-child(4) {
	top: 18px;
}

#humburger-icon.open span:nth-child(1) {
	top: 9px;
	width: 0%;
	left: 50%;
}

#humburger-icon.open span:nth-child(2) {
	-webkit-transform: rotate(45deg);
	-moz-transform: rotate(45deg);
	-o-transform: rotate(45deg);
	transform: rotate(45deg);
}

#humburger-icon.open span:nth-child(3) {
	-webkit-transform: rotate(-45deg);
	-moz-transform: rotate(-45deg);
	-o-transform: rotate(-45deg);
	transform: rotate(-45deg);
}

#humburger-icon.open span:nth-child(4) {
	top: 18px;
	width: 0%;
	left: 50%;
}


/* ===========================
 * ANIMATIONS
** =========================== */

.s-show {
	animation: show 0.3s forwards;
}

.s-hide {
	animation: hide 0.3s forwards;
}

@keyframes show {
	1% {
		opacity: 0;
	}
	2% {
		z-index: 2;
	}
	to {
		z-index: 2;
		opacity: 1;
	}
}

@keyframes hide {
	from {
		opacity: 1;
	}
	to {
		z-index: 0;
		opacity: 0;
	}
}