<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <defs>
    <clipPath id="circle">
      <circle cx="50" cy="50" r="48"/>
    </clipPath>
  </defs>
  <circle cx="50" cy="50" r="48" fill="#0f0f0f"/>
  <circle cx="50" cy="50" r="48" fill="none" stroke="#0f0f0f" stroke-width="2"/>
  <text x="50" y="50" font-family="Arial, Helvetica, sans-serif" font-size="58" font-weight="900" fill="#ffffff" text-anchor="middle" dominant-baseline="central">H</text>
</svg>
