JSFiddle - React, Tailwind, and code Playground

by Vladimir

HTML

<div class="block">
  <div class="back"></div>
  <div class="form"><h2>Успейте купить до подорожания!</h2></div>
</div>

CSS

.block {
  overflow: hidden;
  height: 500px;
  position: relative;
}
.back {
  border: 300px solid orange;
  width: 5000px;
  height: 5000px;
  box-sizing: border-box;
  position: absolute;
  bottom: 100px;
  border-radius: 50%;
  margin-left: -2500px;
  left: 50%;
}
.form {
  width: 300px;
  background: #eee;
  border: 1px solid silver;
  height: 400px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}