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);
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);
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>
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%;
}Display effect:
chrome:
firefox:
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