There are usually three ways to achieve background transparency in css. The following are the ways to write the opacity of these three ways to 80%:
Opacity:x of css3 , the value of x is from 0 to 1, such as opacity: 0.8
rgba(red, green, blue, alpha) of css3, the value of alpha is from 0 to 1, such as rgba(255,255,255,0.8)
IE exclusive filter filter:Alpha(opacity=x), the value of x is from 0 to 100, such as filter:Alpha(opacity=80)
(Video tutorial recommendation: css video tutorial)
1. Opacity of css3
Compatibility: IE6, 7, and 8 are not supported, but IE9 and above and standard browsers are supported Support
Instructions for use: All descendant elements that set the opacity element will be transparent together. It is generally used to adjust the overall opacity of the image or module
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>背景透明度</title>
<style>
.demo{
padding: 25px;
background-color:#000000;
filter:alpha(opacity:50); opacity:0.5; -moz-opacity:0.5;-khtml-opacity: 0.5;
}
.demo p{
color: #FFFFFF;
}
</style>
</head>
<body>
<div class="demo">
<p>背景透明，文字也透明</p>
</div>
</body>
</html>After using opacity, the entire module will be transparent The effect is as follows:
Then it is not advisable to use opacity to achieve "transparent background, opaque text".
2. rgba of css3
The so-called RGBA color, as the name implies, is the color of R G B A. To be more specific, it is the color of red green blue alpha, which translates to red and green. Blue Alpha transparent color.
background:rgba(200, 54, 54, 0.5);
Among them, the 0 in front of 0.5 indicating translucency can be omitted, or directly .5 is also acceptable.
Compatibility: IE6, 7, and 8 are not supported, IE9 and above and standard browsers are supported
How to solve the problem that IE8 browser does not support rgba:
background:rgba(0,0,0,0.5); filter: progid:DXImageTransform.Microsoft.gradient(startcolorstr=#7F000000,endcolorstr=#7F000000);
Instructions for use: Set the opacity of the color, generally used to adjust the opacity of background-color, color, box-shadow, etc.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>css3的rgba</title>
<style>
.demo{
padding: 25px;
background-color:#000000;/* IE6和部分IE7内核的浏览器(如QQ浏览器)下颜色被覆盖 */
background-color:rgba(0,0,0,0.2); /* IE6和部分IE7内核的浏览器(如QQ浏览器)会读懂，但解析为透明 */
}
.demo p{
color: #FFFFFF;
}
</style>
</head>
<body>
<div class="demo">
<p>背景透明，文字也透明</p>
</div>
</body>
</html>Use rgba in background-color. In standard browsers, the background is transparent and the text is opaque. The effect is as follows:
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