What is the best way to create an inner radius using CSS?

I need some assistance in creating a div similar to the one shown https://i.sstatic.net/tqPPG.png

Answer №1

Technique # 01:

Implementing a radial-gradient:

body {
  background: #f0f0f0;
  margin: 0;
}
.box {
  background: radial-gradient(circle at bottom right, transparent 60px, #000 60px);
  height: 150px;
  width: 250px;
}
<div class="box"></div>

Technique # 02:

You can achieve this by using the :before or :after pseudo elements along with the box-shadow css property.

body {
  background: #f0f0f0;
  margin: 0;
}
.box {
  position: relative;
  overflow: hidden;
  height: 150px;
  width: 250px;
}

.box:before {
  box-shadow: 0 0 0 1000px #000;
  border-radius: 100%;
  position: absolute;
  bottom: -30px;
  height: 100px;
  right: -35px;
  width: 100px;
  z-index: -1;
  content: '';
}
<div class="box"></div>

Answer №2

To achieve the desired effect, the easiest approach is to utilize a pseudo element. By positioning the :after element absolutely, you can easily implement this solution.

.box {
  background: #000;
  width: 300px;
  height: 150px;
  position: relative;
}
.box:after {
  content: '';
  position: absolute;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: #fff;
  right: -75px;
  bottom: -75px;
}
<div class="box"></div>

Answer №3

Give this CSS code a shot:

.rectangle{
    height: 200px;
    background: black;
    position: relative;
    width:600px;
}

.rectangle:after {
    content: '';
    position: absolute;
    bottom: -20px; right: -20px;
    border-bottom: 100px solid white;
    border-left: 100px solid white;
    width: 0;
    background:#fff;
    border-radius:150px;

}

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