Why Doesn\'t Inset Box-Shadow Work Over Images, and How to Fix It?

Inset Box-Shadow Not Overlapping Images: A Dilemma Resolved

Inset box-shadow is a powerful tool for creating depth and emphasis in web design. However, it can encounter challenges when applied over images. This article examines why inset box-shadow does not work over images and presents a solution using the CSS :after pseudo element.

The Problem

When applying inset box-shadow to a container that includes images, the shadow may not appear over the images themselves. Instead, the shadow will only affect the background of the container. This can create the illusion that the images are floating above the shadow.

Explanation

The reason for this behavior lies in the rendering mechanism of web browsers. Inset box-shadow is applied to the background of an element, which is typically a solid color or gradient. When an image is placed within the element, the browser considers the image to be a separate element with its own independent background. As a result, the inset box-shadow will not affect the image's background.

Solution: CSS :after Pseudo Element

To overcome this challenge, we can utilize the :after pseudo element. By adding a :after pseudo element to the container and applying the inset box-shadow to it, we can create a new layer that will overlay the images.

<code class="css">main::after {
  box-shadow: inset 3px 3px 10px 0 #000000;
  content: '';
  display: block;
  height: 100%;
  position: absolute;
  top: 0;
  width: 100%;
}</code>

This CSS code creates a :after pseudo element with the same width and height as the container. It is positioned absolutely within the container and placed at the top. The inset box-shadow is applied to the :after pseudo element, ensuring that it overlaps the images.

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