JSFiddle - React, Tailwind, and code Playground

by batcave

HTML

<div class="block">
  
</div>

CSS

.block {
  width: 40rem;
  height: 20rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1600' height='480' preserveAspectRatio='none' fill='none' viewBox='0 0 1600 480'%3E%3Cpath fill='%23012644' d='M0 0h1600v480H0z'/%3E%3Cpath fill='%23015758' fill-rule='evenodd' d='M0 480h642.911C694.357 413.756 725 330.467 725 240c0-90.467-30.643-173.756-82.089-240H0v480Z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: 100% 100%;
  background-repeat: no-repeat;
  background-color: red;
}