<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__dark-side"
    fill="currentColor"
    viewBox="0 0 32 32"
  >
    <path d="M16 .5C7.4.5.5 7.4.5 16S7.4 31.5 16 31.5 31.5 24.6 31.5 16 24.6.5 16 .5zm0 28.1V3.4C23 3.4 28.6 9 28.6 16S23 28.6 16 28.6z" />
  </svg>
</button>