.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #eee;
  border-top-color: #333;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 8px 0;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.box {
  border: 1px solid #ddd;
  padding: 8px;
  margin: 8px 0;
  border-radius: 4px;
}
.box.success {
  background: #e8f7ee;
  border-color: #32a852;
}
.box.failure {
  background: #fdecea;
  border-color: #e12d39;
}