指定要素に背景画像が常にある形でフィット - cover - div { background-image:url(画像URL); background-position:center top; background-repeat:no-repeat; -moz-background-size:cover; background-size:cover; } html { ... filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/wp-content/uploads/2011/01/background-photo.jpg', sizingMethod='scale'); -ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/w