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.mahou1 {
position: relative;
padding-bottom: 56.25%;
padding-top: 30px;
height: 0;
overflow: hidden;
margin-top: 20px;
margin-bottom: 20px;
}
.mahou1 iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}

↓画像テスト

20140401_1.jpg

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