<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100" viewBox="0 0 200 100">
  <rect width="200" height="100" fill="#1e3a8a" rx="5"/>
  <text x="100" y="55" font-family="Arial, sans-serif" font-size="16" font-weight="bold" fill="white" text-anchor="middle">邀请好友，赚爆金币</text>
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