CSS Animation
ตัวอย่าง CSS Animation effects

CSS Transition

.btn {
  background: blue;
  transition: background 0.3s ease;
}
.btn:hover { background: darkblue; }

CSS Keyframes

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}