body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 50px;
  background-color: #f8f9fa;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

.spinner-border {
  width: 3rem;
  height: 3rem;
}

.download-btn {
  margin-top: 20px;
}

.buy-button {
  position: relative;
  padding: 15px 30px;
  font-size: 18px;
  background-color: #0070ba;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.buy-button .spinner {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 3px solid transparent;
  border-top: 3px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  visibility: hidden;
}

.buy-button.loading .button-text {
  visibility: hidden;
}

.buy-button.loading .spinner {
  visibility: visible;
}

.buy-button:hover {
  background-color: #005c99;
}

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