How to set transparency to background-image?

As the title states, there is no way to change the transparency of the image itself. The image is written in css with background-image. Is there any way to set the transparency for it?

div{ position: relative; } div:after{ content: ''; display: block; width: 100%; height: 100%; position: absolute; top: 0; right: 0; bottom: 0; left: 0; background: url(...); opacity: 0.5; }

Use png as the background image with transparency.

The element sets transparency as the background, and another element covers it and makes a guest appearance on it, pretending to be the content of this element.

The opacity attribute of css can set the transparent attribute of the image.

#div{ background-image: url(img.png); opacity:0.4; filter:alpha(opacity=40);/* 针对 IE8 以及更早的版本 */ }

cannot change the transparency of the image itself. It can only change the transparency of the entire DIV to achieve a similar visual effect:
1 .opacity attribute
2. If compatibility allows, use the css3 filter-webkit-filter (different from the previous IE filter).

Look at the implementation method of this website

Opacity in CSS background images

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