8 Answers · CSS alpha transparency method (doesn't work in Internet Explorer 8): #div{background-color:rgba(255,0,0,0.5);} · Use a transparent PNG ... ... <看更多>

Set background opacity From http://stackoverflow.com/questions/4183948/css-set-background-image-with-opacity - background-opacity.css. ... <看更多>

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When we opt for css background image opacity, the opacity property will help to change the transparency of the background image of that element with child ... ... <看更多>