How to Cut a Circle from a Rectangle Using Only CSS?

Cut out a Circle from a Rectangular Shape in CSS

One approach to creating this effect is by using a combination of elements and a clever use of border-radius. However, this technique suffers from potential drawbacks, such as irregular markup and an unsightly gap in certain browsers.

Alternative Approach

Fortunately, there is an alternative method that employs a single element along with a pseudo element. This approach leverages the power of radial-gradient backgrounds for the parent element, while the pseudo element serves as the transparent circle cutout.

Consider the following code snippet:

Explanation

• The div element defines the rectangular shape, complete with rounded corners.
• Inside the div, the pseudo element :before creates the circular cutout using absolute positioning and a solid red border.
• The transparent gap and fill effect is achieved through the application of a radial gradient background on the div element. The gradient creates a transparent area at the center, which overlaps with the pseudo element's circle, resulting in the cutout effect.

This technique offers a number of advantages:

• It eliminates the need for additional elements, simplifying the markup.
• It works consistently across browsers without any noticeable artifacts.
• The circle can be precisely centered within the rectangle using simple calculations.

By implementing this alternative approach, you can effectively cut out a circle from a rectangular shape in CSS, achieving the desired visual result without the complexities and pitfalls of previous methods.

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