In CSS, you can use the rgba function to achieve transparent background and opaque text. You only need to set "rgba (value, value, value, value)" for the background of the element; where transparency (A) takes the value 0 Between ~1, it represents transparency. A value of 0 represents completely transparent, and a value of 1 represents completely opaque.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
Use rgba in css3:
r: red, take a positive integer or percentage;
g: green, take a positive integer or percentage;
b: blue, take a positive Integer or percentage;
a:alpha, take a number between 0 and 1
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>css3的rgba</title>
<style>
*{
padding: 0;
margin: 0;
}
body{
padding: 50px;
}
.mydemo{
padding: 25px;
background-color: red;
background-color:rgba(255,0,0,0.5);
}
.mydemo p{
color: black;
}
</style>
</head>
<body>
<div class="mydemo">
<p>myIp</p>
</div>
</html>
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