<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"
    fill="currentColor"
    class="theme-toggle__inner-moon"
    viewBox="0 0 32 32"
  >
    <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 25.4a9.39 9.39 0 1 1 0-18.8 9.39 9.39 0 1 1 0 18.8z" />
    <circle cx="16" cy="16" r="8.1" />
  </svg>
</button>