<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <rect width="100" height="100" rx="8" fill="#102a43"/>
  <text x="50" y="68" font-family="Georgia, serif" font-size="52" font-weight="bold" fill="#ffffff" text-anchor="middle">CS</text>
</svg>
