JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
  <div class="box__oval"></div>
</div>

SCSS

body {
  background-color: #e5e5e5;
}

.box {
  margin: 100px auto 0 auto;
  width: 600px;
  height: 400px;
  background-color: #fff;
  border-radius: 6px;
  position: relative;
  
  &__oval {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
    border-radius: 50%;
    width: 180px;
    height: 180px;
    background-color: #fff;
    border: 40px solid #e5e5e5;
    
    &::before {
      border-radius: 50%;
      content: '';
      display: block;
      width: 40px;
      height: 40px;
      background: #000;
    }
  }
}