In HTML, if it is a background color, you can use the rgba() function or opacity attribute to set the color transparency; if it is a background image, you can use the opacity attribute and "filter:opacity(%)" style to set it Image transparency.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
1. Set the transparency of the background color--use the rgba() function or the opacity attribute
Example 1:
<style>
#p1 {background-color:rgb(255,0,0,0.3);}
#p2 {background-color:rgb(0,255,0,0.3);}
#p3 {background-color:rgb(0,0,255,0.3);}
#p4 {background-color:rgb(192,192,192,0.3);}
#p5 {background-color:rgb(255,255,0,0.3);}
#p6 {background-color:rgb(255,0,255,0.3);}
</style>
</head>
<body>
<p>RGB 颜色，并使用透明度:</p>
<p id="p1">红色</p>
<p id="p2">绿色</p>
<p id="p3">蓝色</p>
<p id="p4">灰色</p>
<p id="p5">黄色</p>
<p id="p6">樱桃色</p>
</body>Rendering:
Example 2:
<style>
.demo{
width: 280px;
height: 140px;
margin: 50px auto;
}
.demo1,.demo2{
width: 120px;
height: 120px;
margin: 10px;
float: left;
background:#2DC4CB;
}
.demo1{
opacity:1;
}
.demo2{
opacity:0.5;
}
</style>
</head>
<body>
<div class="demo">
<div class="demo1">
<p>背景色不透明，文字不透明！</p>
</div>
<div class="demo2">
<p>背景色透明，文字也透明！</p>
</div>
</div>
</body>Rendering:
2. Set the transparency of the background image--use the opacity attribute and "filter:opacity(%)" style
Example 1:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
div{
width: 300px;
height: 200px;
background-image: url(img/1.jpg);
background-size: 300px;
}
.div1{
-webkit-filter: opacity(50%); /* Chrome, Safari, Opera */
filter: opacity(50%);
}
.div2{
-webkit-filter: opacity(20%); /* Chrome, Safari, Opera */
filter: opacity(20%);
}
</style>
</head>
<body>
<div>
<p>原图：</p>
</div>
<div class="div1">
<p>透明度为50%：</p>
</div>
<div class="div2">
<p>透明度为20%：</p>
</div>
</body>
</html>
Example 2:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
div{
width: 300px;
height: 200px;
background-image: url(img/1.jpg);
background-size: 300px;
}
.div1{
opacity: 0.5;
}
.div2{
opacity: 0.2;
}
</style>
</head>
<body>
<div>
<p>原图：</p>
</div>
<div class="div1">
<p>透透明度为0.5：</p>
</div>
<div class="div2">
<p>透明度为02：</p>
</div>
</body>
</html>
(Learning video sharing: css video tutorial, "html video tutorial")
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