css의 id와 class의 차이

* ID's are unique

Each element can have only one ID

Each page can have only one element with that ID

* Classes are NOT unique

You can use the same class on multiple elements.

You can use multiple classes on the same element.

The “id=something” can be used to style one HTML element, whereas the “class=something” could be used to style multiple elements.

https://css-tricks.com/the-difference-between-id-and-class/