Example analysis of how to set the background of a CSS element to be transparent (image and text)-CSS Tutorial-php.cn

Example analysis of how to set the background of a CSS element to be transparent (image and text)

黄舟

Release： 2017-07-20 09:57:37

Original

1556 people have browsed it

To set the background of a certain element to be transparent, it is like this under chrome, firefox, and opera:

background-color: rgba(0, 0, 0, 0.4);

Copy after login

The last parameter 0.4 in rgba is the desired transparency, ranging from 0 to 1 between.

In ie, it usually looks like this:

background-color: rgb(0, 0, 0);
filter: alpha(opacity=40);

Copy after login

opacity represents transparency, its value range is between 0 and 100

So how to make it compatible with various browsers? Just write them together.

Since ie does not support rgba, it will be ignored. Other browsers generally ignore those that they do not support.

Here’s an example:

HTML code:

<body>
	<p class="non-transparent">
		aaaaa
		</p>
	</body>
	
<p class="transparent">
	<p class="box">
		box
		</p>
	</p>

Copy after login

CSS code:

.non-transparent:hover {
	background-color: yellow;
}

.transparent {
	position: absolute;
	top: 0;
	left: 0;
	
	text-align: center;
	
	width: 100%;
	height: 100%;
	
	filter: alpha(opacity=40);
	background-color: rgb(0, 0, 0);
	
	background-color: rgba(0, 0, 0, 0.4);
}

.box {
	background-color: yellow;
	width: 50%;
	height: 50%;
	
	position: relative;
	left: 5%;
	top: 10%;
}

Copy after login

Display effect:

chrome:

firefox:

##opera:

ie8:

In addition, this can also be done in chrome, firefox, and opera:

opacity: 0.4;

But in this case, the transparency of all sub-elements will be set to the same value, and the effect is as follows:

The above is the detailed content of Example analysis of how to set the background of a CSS element to be transparent (image and text). For more information, please follow other related articles on the PHP Chinese website!