How Can I Create Inverted Scooped Corners in CSS Using Only CSS?

Creating Inverted Scooped Corners Using Pure CSS

In CSS, creating rounded corners is straightforward using the border-radius property. However, achieving inverted scooped corners, where the corners curve inward, requires a more advanced technique.

To create inverted scooped corners, we'll employ the following approach:

• Create a transparent square with hidden overflow.
• Place a transparent circle with a box shadow inside the square.
• Adjust the position of the circle to reveal only a quarter of it.

Code Implementation

#box {
  position: relative;
  width: 200px;
  height: 50px;
  background-color: blue;
  border-radius: 9999px 0 0 9999px;
  margin: 30px;
  text-align: center;
  color: #fff;
  padding-top: 10px;
}

#top,
#bottom {
  position: absolute;
  height: 30px;
  width: 30px;
  right: 0;
  overflow: hidden;
}

#top {
  top: -30px;
}

#bottom {
  bottom: -30px;
}

#top::before,
#bottom::before {
  content: '';
  position: absolute;
  right: 0;
  height: 200%;
  width: 200%;
  border-radius: 100%;
  box-shadow: 10px 10px 5px 100px blue;
  z-index: -1;
}

#top::before {
  top: -100%;
}

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