.txt20px{
    font-size: 1.8em;
    font-family: "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, Osaka, "ＭＳ Ｐゴシック", "MS PGothic", "sans-serif";
    line-height: 2.0em;
}

.embed-container { 
	position: relative; 
	padding-bottom: 56.25%; 
	height: 0; 
	overflow: hidden; 
	max-width: 100%; 
} 
.embed-container iframe, .embed-container object, .embed-container embed { 
	position: absolute; 
	top: 0; 
	left: 0; 
	width: 100%; 
	height: 100%; 
}