.custom-loader {
  margin-left: 20px;
  border: 10px solid #f3f3f3; /* Light grey */
  border-top: 10px solid #3498db; /* Blue */
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 2s linear infinite;
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}