<button
  class="theme-toggle"
  type="button"
  title="Toggle theme"
  aria-label="Toggle theme"
>
  <svg
    xmlns="http://www.w3.org/2000/svg"
    aria-hidden="true"
    class="theme-toggle__half-sun"
    height="1em"
    width="1em"
    viewBox="0 0 32 32"
    fill="currentColor"
  >
    <path d="M27.5 11.5v-7h-7L16 0l-4.5 4.5h-7v7L0 16l4.5 4.5v7h7L16 32l4.5-4.5h7v-7L32 16l-4.5-4.5zM16 25.4V6.6c5.2 0 9.4 4.2 9.4 9.4s-4.2 9.4-9.4 9.4z" />
  </svg>
</button>