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Adding Classes

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About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

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JavaScript

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HTML 

              
                <article>
		<header>
				<h1><img src="https://tatsuya-lab.com/wp-content/uploads/2020/02/title-2.png" alt="CREATOR"/></h1>
		</header>
		<nav>
				<ul>
						<li><a href="#ABOUT">ABOUT</a></li>
						<li><a href="#SERVICES">SERVICES</a></li>
						<li><a href="#PROJECTS">PROJECTS</a></li>
						<li><a href="#TESTIMONIALS">TESTIMONIALS</a></li>
						<li><a href="#CLIENTS">CLIENTS</a></li>
						<li><a href="#CONTACTS">CONTACTS</a></li>
				</ul>
		</nav>
</article>
<main>
		<div id="ABOUT">
				<section>
						<h3>ABOUT</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>
		<div id="SERVICES">
				<section>
						<h3>SERVICES</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>
		<div id="PROJECTS">
				<section>
						<h3>PROJECTS</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>
		<div id="TESTIMONIALS">
				<section>
						<h3>TESTIMONIALS</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>
		<div id="CLIENTS">
				<section>
						<h3>CLIENTS</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>
		<div id="CONTACTS">
				<section>
						<h3>CONTACTS</h3>
						<p>The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who, in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper and the finder of lost children. And I will strike down upon thee with great vengeance and furious anger those who would attempt to poison and destroy My brothers. And you will know My name is the Lord when I lay My vengeance upon thee. </p>
				</section>
		</div>

</main>
!

CSS 

              
                @charset "UTF-8";
/* CSS Document */

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body, html {
	width: 100%;
	height: 100%;
	font-family: Arial, Helvetica, "sans-serif";
	font-size: 12px;
	background-color: crimson;
}




header {
	padding: 20px 0;
}
header > h1 {
	font-size: 50px;
	font-weight: normal;
	text-align: center;
}
main {
	max-width: 100%;
	overflow: hidden;
	margin: 0 auto;
}
main h3 {
	font-size: 60px;
	text-align: center;
}
main p {
	width: 50%;
}
main > div {
	padding: 350px 0;
	color: white;
	background-position: top center;
}
main > div:nth-of-type(odd) {
	background-color: black;
	/*skew*/
	transform: skewY(5deg);
}
main > div:nth-of-type(odd) > section {
	/*skew*/
	transform: skewY(-5deg);
	/*flex*/
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
main > div:nth-of-type(even) {
	background-color: crimson;
	/*skew*/
	transform: skewY(-5deg);
}
main > div:nth-of-type(even) > section {
	/*skew*/
	transform: skewY(5deg);
	/*flex*/
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
main > div:nth-of-type(1) {
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-4-1.jpg);
	background-size: cover;
}
main > div:nth-of-type(2) {
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-1-2.jpg);
	background-size: cover;
}
main > div:nth-of-type(4) {
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-2-1.jpg);
	background-size: cover;
}
main > div:nth-of-type(5) {
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-5-1.jpg);
	background-size: cover;
}
main > div:nth-of-type(6) {
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-3-1.jpg);
	background-size: cover;
}
/*ナビゲーション*/
nav ul {
	list-style-type: none;
	display: flex;
	flex-wrap: wrap;
}
nav li{
	width: 50%;
}
nav a {
	font-size: 14px;
	color: black;
	display: block;
	text-decoration: none;
	padding: 20px 30px;
	text-align: center;
}
nav a:hover {
	background-color: white;
	color: #313131;
}


/*幅768px以上に適用されるCSS（タブレットサイズ以上・幅990px以上にも適用される）*/
@media screen and (min-width:768px){

	header > h1 {
		text-align: left;
		padding-left: 50px;
	}
	/*ナビゲーション*/
	nav ul {
		flex-wrap: nowrap;
	}
	nav li{
		width: auto;
	}

}
/*幅990px以上に適用されるCSS（PCサイズ以上・幅768px以上のCSSが干渉する）*/
@media screen and (min-width:990px){
	article {
		display: flex;
		justify-content: space-between;
		align-items: center;
	}

}
!

JS
!
999px

Console