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Detailed graphic explanation of the differences between rgba, rgb and opacity in CSS
Detailed graphic explanation of the differences between rgba, rgb and opacity in CSS
There are many ways to set background color in CSS, such as background-color, rgb, rgba, etc. Do you know the difference between rgba, rgb and opacity? This article will tell you about the differences between rgba, rgb and opacity. It has certain reference value. Interested friends can refer to it.
The difference between rgb and rgba:
rgb refers to red, green, and blue. The value is between 0 and 255. For example: black can Represented as rgb(0,0,0)
rgba refers to red (red), green (green), blue (blue), transparency (opacity), and the value of transparency is between 0 and 1
The difference between rgba and rgb is that rgba can set the transparency of the background color, but rgb cannot
Example 1: Use background: rgb(255,0,0) to set the background color to red
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.a1{
width: 300px;
height: 200px;
position: relative;
border: 1px solid black;
}
.a2{
width: 200px;
height: 100px;
position: absolute;
top: 50px;
left: 50px;
background: rgb(255,0,0);
}
</style>
</head>
<body>
<div class="a1"></div>
<div class="a2"></div>
</body>
</html>Rendering:
Example 2: Use background: rgba(255,0,0,0.5) to set the background color to translucent red
.a1{
width: 300px;
height: 200px;
position: relative;
border: 1px solid black;
}
.a2{
width: 200px;
height: 100px;
position: absolute;
top: 50px;
left: 50px;
background: rgba(255,0,0,0.5);
}Rendering:
<style type="text/css">
.a1{
width: 300px;
height: 200px;
position: relative;
border: 1px solid black;
}
.a2{
width: 200px;
height: 100px;
position: absolute;
top: 50px;
left: 50px;
background: red;
opacity: 0.5;
}
</style>
<body>
<div class="a1"></div>
<div class="a2">我是盒子里面的内容，文字不需要透明</div>
</body> 
From the rendering You can see the difference between rgba, rgb and opacity. rgb can only set the background color; rgba can set transparency, and the transparency will not act on the elements inside. opacity can set transparency, but the transparency will act on the elements inside. superior.
The above is the detailed content of Detailed graphic explanation of the differences between rgba, rgb and opacity in CSS. For more information, please follow other related articles on the PHP Chinese website!
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