message: X instead of x for close letter
diff: <div class="modal">
  <!-- TODO: Insert backdrop -->
  <div class="content text-blob">
  - <button aria-label="close this popup" on:click={closeModal}>x</button>
  + <button aria-label="close this popup" on:click={closeModal}>X</button>
  <slot />
  </div>
  </div>
  