message: center landing page content
diff: --horizontal-card-gap: var(--boxel-sp-lg);
  width: 100%;
  - max-width:
  - calc(
  - var(--card-width) * 2 + var(--horizontal-card-gap) + var(--boxel-sp-lg) * 2
  - );
  + max-width: 100vw;
  + min-height: 100vh;
  margin: auto;
  padding: var(--boxel-sp);
  + display: flex;
  + align-items: center;
  + justify-content: center;
  }
  .cardstack-landing-page-org-grid {
  + width: 100%;
  + max-width: calc(var(--card-width) * 2 + var(--horizontal-card-gap) + var(--boxel-sp-lg) * 2);
  list-style-type: none;
  padding: 0;
  display: grid;
  