In general, we should avoid modifying things in khan-exercises, since it's coming to us from KA's upstream repo, and we'll need to maintain our forked version and manage merge conflicts from there changes. But in this case, I can see that their CSS was a bit too general (and using the same class name), so probably necessary to comment this out. Please add a comment above this to the effect of:
`/* KA-LITE-MOD: commented out this selector as it conflicted with our Bootstrap styling */`