pinafore/routes/_components/LoadingMask.html

<div class="loading-container {{shown ? 'loading-container-shown' : ''}}">
  <div class="loading-mask">
    <LoadingSpinner maskStyle="true"/>
  </div>
</div>
<style>
  .loading-container {
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    position: fixed;
    z-index: 100;
    pointer-events: none;
  }
  .loading-container.loading-container-shown {
    pointer-events: auto;
  }
  .loading-mask {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--mask-bg);
    opacity: 0;
    transition: opacity 333ms linear;
  }
  .loading-container-shown .loading-mask {
    opacity: 0.6;
  }
</style>
<script>
  import LoadingSpinner from './LoadingSpinner.html'

  export default {
    components: {
      LoadingSpinner
    }
  }
</script>