<button>Button</button>

button {
  border-radius: 3rem;
  corner-shape: squircle;
}

/* Ignore */
button {
  height: 3rem;
  padding: 0 1.5rem;
  display: inline-block;
  align-items: center;
  border: none;
  color: white;
  font: 900 1rem system-ui;
  background: hsl(270 100% 50%);
}