How to set background transparency in html-HTML Tutorial-php.cn

How to set background transparency in html

青灯夜游

Release： 2023-01-06 11:13:38

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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.

How to set background transparency in html

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>

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Rendering:

How to set background transparency in html

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>

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Rendering:

How to set background transparency in html

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>

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How to set background transparency in 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>

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How to set background transparency in html

(Learning video sharing: css video tutorial, "html video tutorial")

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