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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                	<article>
		<section>
			<header>
				<h1><a href="#"><img src="https://tatsuya-lab.com/wp-content/uploads/2020/02/title.png" alt="Landscape"/></a></h1>
				<h2><img src="https://tatsuya-lab.com/wp-content/uploads/2020/02/sub_title.png" alt="a peaceful landscape"/></h2>
			</header>
			<nav>
				<ul>
					<li><a href="#">about</a></li>
					<li><a href="#">blog</a></li>
					<li><a href="#">price</a></li>
					<li><a href="#">lesson</a></li>
					<li><a href="#">contact</a></li>
				</ul>
			</nav>
		</section>

		<main>
			<p>
				Nobody flips to transport, no eyes hear salt from seeing and never plays anything. <br>
				I thought about my face as a small child, thinking of the window <br>
				and hitting the door and shutting down at the door and looking at the carriage suddenly, <br>
				I saw my grandmother and it was a fire, so I could not fit the fire tonight I'm playing the music hall. <br>That Venus without Gauche was a sound of a music shop because he wanted something to sound. </p>
			</main>
		</article>
!

CSS 

              
                * {
	margin: 0;
	padding: 0;

	box-sizing: border-box;/*paddingやborderをwidthやheightに吸収させるための設定*/
}
body, html {
	width: 100%;
	height: 100%;
}
article {
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	background-image: url(https://tatsuya-lab.com/wp-content/uploads/2020/02/p-1.jpg);
	background-size: cover;
	background-position: center center;

	padding: 50px;/*余白をとる*/

	width: 100%;
	height: 100%;
}
p {
	font-size: 14px;
	line-height: 175%;
	color: white;
}
nav ul {
	display: flex;
	flex-wrap: wrap;
	list-style-type: none;
}
nav a:hover {
	border-radius: 5px;
	color: black;
	background-color: azure;
	opacity: .5;
}

h1 img, h2 img {
	max-width: 100%;
	height: auto;
}
nav{
	padding-bottom: 50px;
}
nav li {
	width: 100%;
	text-align: center;
}
nav a {
	font-size: 20px;
	display: block;
	text-decoration: none;
	color: white;
	padding: 5px 30px;
	border-bottom: 1px solid white;
}

/*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){

	article {
		border-radius: 20px;
	}
	nav ul{
		justify-content: space-between;
	}
	nav li {
		width: calc(50% - 15px);
	}
	nav a {
		font-size: 20px;
		display: block;
		text-decoration: none;
		color: white;
		padding: 5px 30px;
		border-bottom: 1px solid white;
	}

}

/*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 {
		border-radius: 20px;
	}
	body {
		padding: 20px;	/*PCサイズでarticleの外に余白をとる*/
	}
	nav ul{
		flex-wrap: nowrap;
		justify-content: flex-start;
	}
	nav li {
		width: auto;
	}
	nav a {
		font-size: 20px;
		display: block;
		text-decoration: none;
		color: white;
		padding: 5px 30px;
		border: none;
	}

}
!

JS
!
999px

Console