<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 180 180">
  <rect x="10" y="10" width="160" height="160" rx="36" ry="36" fill="#dc2626"/>
  <text x="90" y="105" dominant-baseline="central" text-anchor="middle" 
        font-family="Arial, sans-serif" font-size="90" font-weight="bold" fill="white">24</text>
</svg>