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How to set opacity in css

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2021-04-16 16:31:045373browse

The way to set opacity in css is to use [css rgba()] to set color transparency. RGBA color value is an extension of RGB color value, with an alpha channel. The syntax is [rgba (R, G, B, A);].

How to set opacity in css

The operating environment of this tutorial: windows7 system, css3 version, DELL G3 computer.

css method of setting opacity:

css rgba() sets color transparency

Syntax:

rgba(R,G,B,A);

RGBA is the abbreviation of the three words Red (red) Green (green) Blue (blue) and Alpha (opacity). RGBA color values ​​are an extension of RGB color values ​​with an alpha channel - which specifies the opacity of the object.

Introduction to the values ​​in rgba():

R: red value. Positive integer (0~255)

G: green value. Positive integer (0~255)

B: Blue value. Positive integer (0~255)

A: Transparency. The value between 0 and 1

rgba() can simply set the color transparency, which has many applications in page layout. For example: make the background transparent, but the text above is opaque.

Code example:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>rgba()</title>
        <style>
            .demo{
                width: 350px;
                height: 300px;
                margin: 50px auto;
            }
            .demo *{
                width: 120px;
                height: 120px;
                margin: 10px;
                float: left;
            }
            .demo1{
                background:rgba(255,0,0,1);
            }
            .demo2{
                background:rgba(255,0,0,0.5);
            }
        </style>
    </head>
    <body>
        <div class="demo">
            <div class="demo1">背景色不透明,文字不透明!</div>
            <div class="demo2">背景色半透明,文字不透明!</div>
        </div>
    </body>
</html>

Rendering:

How to set opacity in css

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