Question about challenge: Label Bootstrap Buttons

Here are my codes for the challenge. My question is this: why do we need to label the bootstrap buttons? I thought we already id’ed them? Is using span the correct way/only way to do it???

`

jQuery Playground

#left-well

#target1 #target2 #target3

#right-well

#target4 #target5 #target6
`

Juts got an answer from github.
Here’s the explanation and correct answer.