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How to set transparency in css without affecting child elements
- 王林forward
- 2020-08-11 16:56:303233browse
Setting transparency through RGBA is only supported by the latest browsers, supports IE9, and can be set through the alpha channel of RGBA.
(Recommended tutorial: CSS tutorial)
<body> <div style="background-color:rgba(0,255,0,0.2);"> 显示文字 </div> </body>
The first three values are the rgb color values, and the last transparency value is 0~1. The smaller it is, the more transparent it is.
Compatible with all browsers Writing method:
background-color:rgba(0,0,0,0.25); filter:progid:DXImageTransform.Microsoft.Gradient(startColorstr=#40000000,endColorstr=#40000000);
Note: The first two digits of the values of startColorStr and endColorStr are hexadecimal transparency, and the last six digits are hexadecimal color.
The format is #AARRGGBB. AA, RR, GG and BB are hexadecimal positive integers. The value range is 00 - FF.
RR specifies the red value, GG specifies the green value, BB specifies the blue value, see #RRGGBB color unit. AA specifies transparency. 00 is completely transparent. FF is completely opaque. Values outside the value range will be restored to the default value.
(Recommended video tutorial: css video tutorial)
2-digit transparency conversion method: x=alpha*255, convert the calculated result x into hexadecimal Just make it.
JS conversion method for hexadecimal: ; a.toString(16) = 40
Example:
<!DOCTYPE html>
<head>
<meta charset="utf-8"/>
<style type="text/css">
body{margin:0;padding:0;}
.div_content{
background: url("1.gif") no-repeat;
/*给input框添加背景图片，以凸显其透明效果。*/
width: 200px;
height: 200px;
}
.div_content>input{
outline: none;
border: none;
background-color: transparent;
/*必须将背景色设为透明，否则无效。（除非对于要设置的元素本身已经是透明的，如：span元素等）*/
background-color: rgba(0,0,0,0.25);
filter: progid:DXImageTransform.Microsoft.Gradient(startColorstr=#40000000,endColorstr=#40000000);
}
</style>
</head>
<body>
<div class="div_content">
<input type="text" size="20"/>
</div>
</body>
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