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I try to give you a broad picture of my problem. Suppose I have a overlay div on my page with z-index: 99;, with background-color: rgba(0,0,0,0.5). Then I want to remove a part of overlay div, for example 100 x 100px in top: 50px; and left: 200px;.
By removing I mean that exclude a part of overlay div to make that part visible and remove the background-color from that.
How can I do that?
617
With CSS properties, you can easily put two <div> next to each other in HTML. Use the CSS property float to achieve this. With that, add height:100px and set margin.
I'm not sure you can remove part of the background like you describe. Instead, your overlay can have a transparent background and it can contain four blue-ish-background divs that form a frame around the hole you want.
Here's some code that does this:
body {margin: 0; padding: 0}
#main {width: 500px; height: 200px; background: yellow;}
.overlay {background: rgba(0,0,0,0.5); position:absolute;}
#overlay-container { width: 500px; height: 200px; z-index: 99; position: absolute;}
#top {width: 100%; height: 50px}
#left {top:50px; width: 200px; height: 100px}
#right {left: 300px; width: 200px; height: 100px}
#bottom {left: -300px; top: 100px; width: 500px; height: 50px}<div id="main"/>
<div id="overlay-container">
<div class="overlay" id="top"/>
<div class="overlay" id="left"/>
<div class="overlay" id="right"/>
<div class="overlay" id="bottom"/>
</div>You can probably get rid of the overlay-container and simplify things a bit.
For the overlay, you could just use a <div> with a transparent background and a translucent border. Here's another example:
body { margin: 0; padding: 0; }
#background {
width:500px;
height:200px;
background: yellow;
}
#overlay {
border-color: rgba(0,0,0,0.5);
border-style: solid;
border-top-width: 50px;
border-left-width: 200px;
border-right-width: 200px;
border-bottom-width: 50px;
position: absolute;
top: 0;
width: 100px;
height: 100px;
z-index: 99;
}<body>
<div id="background">some content</div>
<div id="overlay"></div>
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