Looks suggestions

[Shadowblitz16]

To begin let me say I like the idea behind this library
However I've noticed that this libraries default theme very unprofessional.

I have a few suggestions how to possibly make it look a bit better.

• Get rid the the thick rounded borders make it flat rounded and possibly in the future when (and if) you support themes allow border and rounding size for all four cardinal directions.

• Make check boxes use check mark instead of x and try to leave some space around it and the edge of the checkbox

• Icons and fonts should be mono space by default. This is because it makes things look better since you won't have icons of different sizes. changing fonts could be a them option

• Scrollbar sliders should be rounded if part 1 of this suggestion is done

• x and minus buttons on windows should not be thinker then 1 pixel unless the minus button is something like imgui's down arrow.

If this suggestion offended you I'm sorry that's not what I meant to do.
I intended to suggest improvements to the default theme to make it look more presentable to people that just look at something and judge it from first impressions.

[flamendless]

Hi there, appreciate the points you raise there. You can make a PR with your desired theme changes and we will check if that is better looking :)

You can refer to this: https://github.com/flamendless/Slab/wiki/Style