opacity-menu.css

body {
	margin: 0;
	padding: 0;
	font-family: sans-serif;
}

section {
	width: 100%;
	height: 100vh;
	background-image: url(opacity-menu.jpg);
	background-size: cover;
}

.menu {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, .5);
	padding: 0, 100px;
	box-sizing: border-box;
	border-bottom: 1px solid rgba(0, 0, 0, .2);
}

.menu img {
	float: left;
	width: 84px;
	border-radius: 30px;
}	

nav {
	position: relative;
	float: right;
}

nav ul {
	margin: 0;
	padding: 0;
	display: flex;
}

nav ul li {
	list-style: none;
}

nav ul li a {
	display: block;
	color: #000;
	text-decoration: none;
	text-transform: uppercase;
	font-weight: bold;
	padding: 33px 20px;
}

nav ul li a:hover {
	background: #0b3c5d;
	color: #fff;
}

nav ul li ul {
	display: block;
	background: rgba(255, 255, 255, .5);
	min-width: 250px;
	position: absolute;
	margin-top: 1px;
	box-shadow: 0 2px 5px rgba(0, 0, 0, .5);
	opacity: 0;
	visibility: hidden;
	transition: .5s;
	transform: translateY(40px);
}



nav ul li:hover ul {
	opacity: 1;
	visibility: visible;
	transform: translateY(0px);
}

nav ul li ul a {
	padding: 10px;
}