JSFiddle - React, Tailwind, and code Playground

by Vadim

HTML

<div class="container">
  <div class="card"></div>
</div>

CSS

.container {
  background-color: royalblue;
  padding: 20px;
  padding-bottom: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom-right-radius: 50% 70px;
  border-bottom-left-radius: 50% 70px;
}

.card {
  width: 200px;
  height: 200px;
  background-color: #fff;
  border-radius: 15px;
}