@charset "UTF-8";

html {
	-webkit-text-size-adjust: 100%;
	font-family: 游ゴシック体, 'Yu Gothic', YuGothic, 'ヒラギノ角ゴシック Pro', 'Hiragino Kaku Gothic Pro', メイリオ, Meiryo, Osaka, 'ＭＳ Ｐゴシック', 'MS PGothic', sans-serif;
	font-size: 16px;
	background-color: #DDD;
}

html, body, #wrapper {
	width: 100%;
	height: 100%;
}

header, main, footer {
	text-align: center;
	color: #FFF;
	line-height: 40px;
}

#wrapper {
	display: flex;
	flex-direction: column;
}

header {
	background-color: red;
	flex: none;/* 0 0 auto と同じ */
	height: 40px;
}

main {
	background-color: orange;
	flex: 1 0 auto;
	line-height: 1.5em
}

footer {
	background-color: green;
	flex: none;/* 0 0 auto と同じ */
	height: 40px;
}

body {
	box-sizing: border-box;
	border: 2px solid #333;
	overflow-y: scroll;
	height: 230px;
	animation: anime 5s ease-in-out 0s infinite;
}

@keyframes anime {
	0%   { height: 230px; }
	50%  { height:  80px; }
	100% { height: 230px; }
}