<div id="popup-overlay">
  <div id="popup-modal">
    <button id="popup-close">×</button>
    <h2>Special Offer!</h2>
    <p>Get 20% off your first purchase. Limited time only!</p>
    <a href="https://example.com" target="_blank" id="popup-button">
      Claim Offer
    </a>
  </div>
</div>

#popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#popup-modal {
  position: relative;
  background: #ffffff;
  width: 500px;
  max-width: 90%;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

#popup-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: #e5e7eb;
  font-size: 24px;
  cursor: pointer;
}

#popup-modal h2 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 16px;
}

#popup-modal p {
  margin-bottom: 24px;
  color: #666;
}

#popup-button {
  display: inline-block;
  padding: 12px 24px;
  background: #3D5AFE;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
}