<svg width="180" height="180" viewBox="0 0 180 180" fill="none" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <linearGradient id="bg" x1="0" y1="0" x2="180" y2="180" gradientUnits="userSpaceOnUse">
      <stop offset="0" stop-color="#224477"/>
      <stop offset="1" stop-color="#0083c8"/>
    </linearGradient>
  </defs>
  <rect width="180" height="180" rx="36" fill="url(#bg)"/>
  <text x="50%" y="52%" dy="0.02em" text-anchor="middle" dominant-baseline="central"
        font-family="Inter, 'Helvetica Neue', Arial, sans-serif" font-size="112" font-weight="700"
        fill="#ffffff" letter-spacing="-2">B</text>
</svg>
