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About the <head>

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CSS

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HTML 

              
                <header>
	<h1>Fixed Angled Header</h1>
</header>

<main>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
	<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Dignissimos dolor accusamus neque laborum atque accusantium perspiciatis, in illo itaque assumenda totam. Facilis, voluptatum ipsum excepturi similique facere unde quos necessitatibus quia culpa
		eligendi consequuntur vero quas eum dolorem voluptates laboriosam? Dolor neque quas minus numquam laboriosam magni voluptatem enim eveniet.</p>
</main>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:400,700);

:root {
	/* Base font size */
	font-size: 10px;

	/* Heading height variable*/
	--heading-height: 30em;
}

body {
	font-family: "Roboto", Arial, sans-serif;
	min-height: 100vh;
	background-color: #101010;
}

header {
	position: fixed;
	width: 100%;
	height: var(--heading-height);
}

/* Create angled background with 'before' pseudo-element */
header::before {
	content: "";
	display: block;
	position: absolute;
	left: 0;
	bottom: 6em;
	width: 100%;
	height: calc(var(--heading-height) + 10em);
	z-index: -1;
	transform: skewY(-3.5deg);
	background: 
		linear-gradient(rgba(0,0,0,.6), rgba(0,0,0,.6)),
		url(https://images.unsplash.com/photo-1495464101292-552d0b52fe41?auto=format&fit=crop&w=1350&q=80) no-repeat center,
		linear-gradient(#4e4376, #2b5876);
	background-size: cover;
	border-bottom: .2em solid #fff;
}

h1 {
	font-size: calc(2.8em + 2.6vw);
	font-weight: 700;
	letter-spacing: .01em;
	padding: 10rem 0 0 4.5rem;
	text-shadow: .022em .022em .022em #111;
	color: #fff;
}

main {
	padding: calc(var(--heading-height) + 1.5vw) 4em 0;
}

p {
	font-size: calc(2em + .25vw);
	font-weight: 400;
	line-height: 2;
	margin-bottom: 1.5em;
	color: #fcfcfc;
}
!

JS
!
999px

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