How to achieve background transparency in CSS in web design? (Example)-CSS Tutorial-php.cn

How to achieve background transparency in CSS in web design? (Example)

藏色散人

Release： 2018-08-25 17:36:32

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In web design, sometimes it is necessary to achieve the effect of css background transparent text opaque. So how to make the background transparent through css? This article will introduce to you how to use CSS to set the background to be transparent and the text to be opaque. Hope it helps friends in need.

The specific code example of css background transparent text opaque is as follows:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>css div背景透明示例</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }

        body{
            padding: 50px;
            background: url(img/2.png) 0 0 repeat;
        }

        .demo{
            padding: 25px;
            background-color: rgba(0,0,0,0.5);/* IE9、标准浏览器、IE6和部分IE7内核的浏览器(如QQ浏览器)会读懂 */
        }
        .demo p{
            color: #FFFFFF;
        }
    </style>
</head>
<body>
<div class="demo">
    <p>css背景透明文字不透明</p>
</div>
</body>
</html>

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The effect is as follows:

How to achieve background transparency in CSS in web design? (Example)

From As can be clearly seen from the above picture, css achieves the effect of transparent div background and opaque text. The knowledge point we need to master here is the rgba() function in background-color. Use the format rgba(0,0,0,0.5); in css to represent rgha. The last parameter represents the Alpha channel, which represents transparency.

By the way, there are three ways to define colors in CSS: using color methods (RGB, RGBA, HSL, HSLA), hexadecimal color values and predefined color names. RGBA is the abbreviation for the three words Red (red) Green (green) Blue (blue) and Alpha (opacity).

Value:

R	Red value. Positive integer \| Percent
G	Green value. Positive integer \| Percent
B	Blue value. Positive integer \| Percent
A	Alpha transparency. The value is between 0~1.

So through the above introduction on the effects of setting background transparency and text opacity using css, I hope it will be helpful to friends in need.

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R	Red value. Positive integer \| Percent
G	Green value. Positive integer \| Percent
B	Blue value. Positive integer \| Percent
A	Alpha transparency. The value is between 0~1.