Common Animations in CSS

/* Spin */
@keyframes spin {
  to { transform: rotate(360deg); }
}
.spinner { animation: spin 1s linear infinite; }

/* Pulse */
@keyframes pulse {
  50% { transform: scale(1.1); }
}
.pulse { animation: pulse 2s ease infinite; }

/* Shake */
@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}