Fix issue of extra margin in bottom

[subhahu123]

Fixed Issues : #90
##Description of Changes
removing extra margin in bottom by changing demo.css file

##Before changes

##After Changes

LGTM
@ajzliu @Rishabh570 @pabisovsky @radheyshyamjangid @starkblaze01 @faithngetich @VaaibhaviSingh

[welcome]

Thanks for opening this pull request! Dangerbot will test out your code and reply in a bit with some pointers and requests.
There may be some errors, but don't worry! We're here to help! 👍🎉😄

[subhahu123]

@publiclab/reviewers please review

[subhahu123]

LGTM @jywarren @icarito @phillipesouza @pablohildo

[Rishabh570]

LGTM 🎉

[subhahu123]

@Rishabh570
merge this

[Rishabh570]

Let others have their POVs first...

[subhahu123]

@Rishabh570
NO review still

[subhahu123]

@Rishabh570
this repository do not response

[Rishabh570]

Pinging @publiclab/reviewers

[jywarren]

Hello @subhahu123 - thank you for your contributions. Please be patient as Public Lab coding is almost entirely a volunteer effort, and a day or two may go by before you get a response, depending on how busy people are. Also, while we understand if you're frustrated, please take a look at our Code of Conduct, and keep in mind that it's important to be respectful and friendly in this community. We deeply appreciate your help in this.

I'll take a look now!

[welcome]

Congrats on merging your first pull request! 🙌🎉⚡️
Your code will likely be published to https://code.publiclab.org in the next few days.
In the meantime, can you tell us your Twitter handle so we can thank you properly?
Now that you've completed this, you can help someone else take their first step!
See: Public Lab's coding community!

[jywarren]

Great, thanks again!