how to create shape with half square and curved shape uisng css and html

Question

i am trying to draw a shape exactly given in the image below

here is my html and css code which gives shape somewhat similar to this but in single color i am not getting how can i do it in multicolor. Can anybody explain me how i can do it. Thanks in advance.

.right-angle-triangle-semicircle {
  width: 100px;
  height: 100px;
  background: #FFA6DF;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  border-bottom-right-radius: 50%;
  border-bottom-left-radius: 0;
}

<div class="right-angle-triangle-semicircle"></div>

Answer 1

Using just a single element, you can use a few small CSS tricks to achieve this.

No magic numbers, and will work with different resizing the element too.

Further to this, you can skip all the border-radius declarations into a single line.

border-radius: 0 0 50% 0;

.right-angle-triangle-semicircle {
  width: 100px;
  height: 100px;
  background: lightgray;
  border-radius: 0 0 50% 0;
  overflow: hidden;
  position: relative;
}

.right-angle-triangle-semicircle:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: #FFA6DF;
  width: 200%;
  transform: rotate(-45deg);
  transform-origin: bottom left;
}

<div class="right-angle-triangle-semicircle"></div>