Why Does My Fixed-Positioned Element Appear in Front of a Statically-Positioned Element with a Higher z-index?

z-index Issue Solved: Understanding Fixed Positioning

Despite setting z-indexes, it can sometimes be challenging to make a fixed positioned element appear behind a statically positioned one. A common workaround involves using absolute positioning on the static element.

To delve deeper into this behavior, consider the following example:

<div>

#over {
  width: 600px;
  z-index: 10;
}

#under {
  position: fixed;
  top: 5px;
  width: 420px;
  left: 20px;
  z-index: 1;
}

As you'll notice, the fixed element (with z-index 1) remains in front of the static element (with z-index 10). This occurs because by default, static positioned elements have no stacking context, meaning they are unaffected by z-index.

To resolve this, you can define a stacking context for the static element by adding position: relative to it. This creates a new z-index layer within which the z-index property functions as expected.

#over {
  width: 600px;
  z-index: 10;
  position: relative;
}

Now, the fixed element will appear behind the static element, as intended. This simple adjustment ensures proper z-index behavior, allowing you to control the layering of elements effectively.

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