<button
  class="theme-toggle"
  type="button"
  title="Toggle theme"
  aria-label="Toggle theme"
>
  <svg
    xmlns="http://www.w3.org/2000/svg"
    aria-hidden="true"
    width="1em"
    height="1em"
    class="theme-toggle__simple"
    fill="currentColor"
    viewBox="0 0 32 32"
  >
    <clipPath id="theme-toggle__simple__cutout">
      <path d="M0-5h55v37h-55zm32 12a1 1 0 0025 0 1 1 0 00-25 0" />
    </clipPath>
    <g clip-path="url(#theme-toggle__simple__cutout)">
      <circle cx="16" cy="16" r="15" />
    </g>
  </svg>
</button>