Update style to look a touch more modern

[artoonie]

This updates the theme a touch to add padding and colors and make it look a tiny bit more modern.

Before	After

[artoonie]

I've fixed the issues shown in the screenshots above:

[yezr]

I like the new buttons and the rounded text boxes. Some things I noticed looking through that would be nice to address

1 - Name is cut off
2 - Light blue padding line?
3 - White padding around the grey background. Should it be all white or all grey? I'm thinking about change to the white background in each tab as well. Do we want it to be white or grey? The white seems almost like high contrast
4 - log messages extra padding

[artoonie]

Good eye! All addressed here:

As for (3), you mean changing the overall background color? I don't see much of a visual difference between white and the light gray we have on my screen.

[HEdingfield]

One word of warning when making changes like this: please try to test in all 3 OSes (Windows, Linux, MacOS) before committing, as we can see UX regressions when messing with padding, fonts, etc.

Not 100% required, but definitely recommended.