s5.css

body
		{
			margin: 0;
			padding: 0;
			font-family: sans-serif;
			background-color: #fff;
		}
		nav {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100px;
	padding: 10px 100px;
	box-sizing: border-box;
	transition: all .8s ease-in-out;
	z-index: 1;
}

nav.black {
	background: rgba(0,0,0,0.6);
}

nav .logo {
	float: left;
}

nav .logo img {
	height: 80px;
	transition: all .8s ease-in-out;
}

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

nav ul li {
	list-style: none;
	display: inline-block;
}

nav ul li a {
	line-height: 80px;
	color: #fff;
	padding: 5px 20px;
	text-decoration: none;
	text-transform: uppercase;
	border: 1px solid transparent;
	transition: .8s ease;
}

nav ul li a.active,
nav ul li a:hover {
	color: #000;
	background-color: white;
}


		section
		{
			width: 100%;
			height: 100vh;
		}
		section.sec1
		{
			background: url(114.jpg);
			background-size: cover;
			background-position: center;
			box-sizing: border-box;
		}
		section.sec2
		{
			padding: 100px;
			box-sizing: border-box;
			height: auto;
		}

		section.sec2 h1
		{
			font-size: 3em;
			margin: 0;
			padding: 0 0 20px;
			color: #000;
			text-align: center;
		}
		section.sec2 h2
		{
			font-size: 2em;
			margin: 0;
			padding: 0 0 20px;
			color: #000;
		}

		section.sec2 h3
		{
			font-size: 1.5em;
			margin: 0;
			padding: 0 0 20px;
			color: #000;
		}

		section.sec2 p
		{
			font-size: 1.6em;
			margin: 0;
			padding: 0;
			color: #000;
		}
		section.sec3
		{
			box-sizing: border-box;
		}