section { /* Initial state, without the class. */
	background-color: gold;
	padding: calc(var(--base) / 2);
	transition: all 1s ease-in-out; /* Transition everything. */
	will-change: transform; /* Improves the aliasing! */

	&.highlight { /* When the class is applied with JS! */
		background-color: aquamarine;
		transform: rotate(5deg);
	}
}