Updating css for light theme

[yafp]

Regarding issue #6: I did a quick test and added a bottom border with 1px for all tabs to make each tab as single element better visible.

As i don't know if you like the basic idea - i just did that test with the light theme. Feel free to tell me if you like it or not - if not - i guess i'll permanently fork it and host my modified version myself.

btw: thanks for the xpi & your work. Love it.

[Croydon]

I will merge this in my own fork of the addon as well. Thanks :)

[yafp]

@Croydon great - keep in mind this was just a test and therefor the other themes are untouched so far.

Just realized you seem to work on an active developed fork. How far is your migration to package.json?

[Croydon]

Since I comment on here, this is appearing in my pull request board. Maybe considering closing this? :)