JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
  <div class="circle">
  </div>
</div>

CSS

.content {
  width: 300px;
  padding: 50px;
  background: #3f63d3;
}

.circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 10px solid #fff;
  border-top-color: transparent;
  transform: rotate(45deg);
}