<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
  <rect width="32" height="32" fill="#222"/>
  <text x="50%" y="50%" font-family="'Segoe UI', Tahoma, Geneva, Verdana, sans-serif" font-size="18" font-weight="bold" fill="#ffffff" text-anchor="middle" dominant-baseline="middle">SH</text>
</svg>