How to Create See-Through Holes in CSS Overlays Without JavaScript?

Creating See-Through Holes in Overlays with CSS

When working with overlays, it can be desirable to create transparent sections within them, allowing viewers to see through to the underlying web page. This effect can be achieved solely through CSS, eliminating the need for JavaScript.

One effective method involves utilizing the box-shadow property with an exceptionally large spread radius. By doing so, you essentially create an expansive shadow that overlaps the underlying elements, effectively obscuring them.

To illustrate this technique, consider the following CSS code:

.hole {
  position: absolute;
  top: 20px;
  left: 20px;
  width: 200px;
  height: 150px;
  box-shadow: 0 0 0 9999px rgba(0, 0, 255, 0.2);
}

When applied to an HTML element, this code will produce a transparent hole within the overlay, as can be seen in the following example:

HTML:

<p>Lorem ipsum dolor sit amet, ocurreret tincidunt philosophia in sea, at pro postea ullamcorper. Mea ei aeque feugiat, cum ut utinam conceptam, in pro partem veritus molestiae. Omnis efficiantur an eum, te mel quot perpetua. Ad duo autem dolore, vocent lucilius te cum, ut duo quem singulis.</p>
<p>Has ex idque repudiandae, an mei munere philosophia. Sale molestie id eos, eam ne blandit adipisci. Ei eam ipsum dissentiunt. Ei vel accusam dolores efficiantur.</p>

<div class="hole"></div>

In conclusion, using box-shadow with a large spread radius offers a simple and effective way to create transparent holes within CSS overlays, allowing for a dynamic and visually appealing effect.

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