Creating a div that overlays other divs using html and css

On websites like Facebook and LinkedIn, there is a search box where you can type in your query and the results will display below it, covering up other content on the page. This functionality is shown in the screenshot below from LinkedIn.

I am curious about how this feature can be implemented. How can I create a search div (or should it be a different element?) that overlays other elements on the page?

For reference: some of my existing divs are set to position:fixed which may need to be overridden for this effect.

htmlcss

Answer №1

To control the stacking order of elements on a webpage, use z-index. Elements with higher z-index values are placed on top of those with lower values.

For instance, #div-1 will be displayed above div-2 since div-2 has no specified z-index (defaulting to either 0 or the parent's z-index). Even though div-3 has a smaller z-index, it will appear above div-2.

#div-1 {
    z-index: 3523;
}

#div-2 {
}

#div-3 {
    z-index: 29;
}

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