#mas-payment-processing-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.85);
  z-index: 99999;
  text-align: center;
  padding-top: 20vh;
  font-family: Arial, Verdana, sans-serif;
}
#mas-payment-processing-overlay.mas-visible {
  display: block;
}
#mas-payment-processing-overlay .mas-spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border: 5px solid #ddd;
  border-top-color: #008000;
  border-radius: 50%;
  animation: mas-spin 0.8s linear infinite;
}
#mas-payment-processing-overlay .mas-spinner-text {
  font-size: 18px;
  color: #333;
}
@keyframes mas-spin {
  to { transform: rotate(360deg); }
}