body, html {
  height: 100%;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
}

#landing-page {
  text-align: center;
}

.loader {
  border: 5px solid #f3f3f3;
  border-top: 5px solid #3498db;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

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