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/*在背景上面再多一層重複小圖*/
._lch_:before {
	/*這裡勿動*/ content:""; display:block; width:100%; height:100%; position:absolute; background: repeat center;
	/*透明度*/ opacity: 0.5;
	/*大小*/ background-size: 100px 100px;
	/*圖片*/ background-image:url(圖片網址);
}