How Can I Create Inverted Scooped Corners Using Only CSS?

Using CSS to Create Inverted Scooped Corners

In CSS, it's possible to create a range of shapes and effects through various techniques. One such effect is the creation of inverted scooped corners, where the corners of a shape have a concave (scooped out) appearance.

Achieving Inverted Scooped Corners

To achieve this effect purely using CSS, we can employ a combination of the box-shadow and overflow properties. The process involves creating the following elements:

1. Transparent Square with Overflow Hidden: This creates a basic square container with the overflow property set to hidden to prevent any elements from spilling outside of the container.
2. Transparent Circle with Box Shadow: A transparent circle is created with the box-shadow property, which adds a shadow effect to the circle.
3. Adjusting the Position of the Circle: The circle's position is adjusted using the top or bottom properties, allowing only a specific part of the circle (e.g., a quarter) to be visible. This creates the illusion of an inverted scooped corner.

Example Code

To illustrate how this works, consider the following CSS code:

#box {
  ...
  border-radius: 9999px 0 0 9999px;
}

#top,
#bottom {
  ...
}

#top::before,
#bottom::before {
  ...
  box-shadow: 10px 10px 5px 100px blue;
}

Explanation

The #box element serves as the main container with rounded corners except for the top right and bottom right corners. The #top and #bottom elements are the square containers with hidden overflow, while the ::before pseudo-elements for both are the transparent circles with the box shadow effect. By adjusting the top and bottom properties of these pseudo-elements, we can control which part of the circle is visible, creating the desired scooped corners.

By combining these techniques, it's possible to achieve inverted scooped corners using pure CSS, providing flexibility and control over the shape and appearance of your designs.

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