<section>
  <h1>Section Heading</h1>
</section>

section {
  corner-shape: bevel;
  border-bottom-right-radius: 100% 50px;
}

/* Ignore */
body {
  margin: 0;
  section {
    height: 90vh;
    display: flex;
    color: white;
    background: hsl(270 100% 50%);
    h1 {
      margin: auto;
      font-weight: 900;
      font-family: system-ui;
    }
  }
}