CSS Secrets by Lea Verou
Author:Lea Verou
Language: eng
Format: epub
Publisher: O’Reilly Media, Inc.
Published: 2015-10-23T16:00:00+00:00
}
main::before {
content: '';
position: absolute;
top: 0; right: 0; bottom: 0; left: 0;
background: rgba(255,0,0,.5); /* for debugging */
}
We also applied a semi-transparent red background, so we can see what we’re doing, otherwise debugging becomes difficult when we’re dealing with a transparent (and therefore, invisible) element. As you can see in Figure 4.18, our pseudo-element is currently above our content, thus obscuring it. We can fix this by adding z-index: -1; (Figure 4.20).
Be careful when using a negative z-index to move a child underneath its parent: if said parent is nested within other elements with backgrounds, the child will go below those as well.
Now it’s time to replace that semi-transparent red background, with one that actually matches our backdrop, either by copying over the <body> background, or by splitting it into its own rule. Can we blur now? Let’s try it:
Why not just use background: inherit on main::before? Because then it will inherit from main, not body, so the pseudo-element will get a semi-transparent white background as well.
body, main::before {
background: url("tiger.jpg") 0 / cover fixed;
}
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