What is the best way to ensure that two divs, each at 100% width, can fill and overlap

To achieve the desired effect of overlapping without using position: absolute;, and considering that iframe is not an option, you can try setting up the parent and child elements as shown below:

<div id='parent' style="width: 200px; height: 200px; background-color: yellowgreen;">
  <div id='child-1' style="width: 100%; height: 100%; background-color: orange; opacity: 0.5;"></div>
  <div id='child-2' style="width: 100%; height: 100%; background-color: dimgray; opacity: 0.5;"></div>
</div>

The expected outcome based on the code provided would be a single 200x200 square with a blend of yellow-green, orange, and dimgray colors at 50% opacity, similar to the image linked here: https://i.sstatic.net/fzfzosK6.png.

htmlcss

Answer №1

Utilizing the display: grid; property on the main div establishes a grid layout. Assigning grid-area: 1 / 1 / 2 / 2; to each child div positions them in the same grid cell, resulting in an overlapping effect.

<div id="parent" style="width: 300px; height: 300px; background-color: yellowgreen; display: grid;">
  <div id="child-1" style="width: 100%; height: 100%; background-color: orange; opacity: 0.5; grid-area: 1 / 1 / 2 / 2;"></div>
  <div id="child-2" style="width: 100%; height: 100%; background-color: dimgray; opacity: 0.5; grid-area: 1 / 1 / 2 / 2;"></div>
</div>

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