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                <div class="flex-box">
	<div class="flex-box__item"></div>
	<h2 class="title">タイトルがここに書かれる</h2>
	<div class="flex-box__item"></div>


	font-size: 60px
	color: yellow
	text-align: center

	//flex-box を指定する要素には幅を指定する。
	width: 640px
	background-color: blue
	//おやう要素に flex を指定
	display: flex
	flex-direction: row
	justify-content: space-between
	align-items: center
	//display: flex した対象の
		width: 150px
		height: 10px
		background-color: red
		border: solid 1px black