Beginnings of a GUI, Exercise with olc::PixelGameEngine

I have never really delved into the process of what it would take to really build a responsive GUI that can be easily scaled using concepts such as panel size, button size, border size, with the only arbitrary positional elements being the top left origin.

Recording this snippet I discovered a bug! Which I will be fixing soon.
This was to showcase my first scroll bar implementation, and I'm running into a frustrating issue that I'm almost certain is mainly due to floating point accuracy, but I'm not ready to throw in the towel yet.

I plan on using this to make a simple interface for information processing, mainly for the practice. Most of the math is relatively easy, but some of the bugs have been very difficult to iron out.

I will probably make a showcase allowing quick change of key scalar values to demonstrate how the UI represents different various ratios.

Tinkering around with maybe a drop and drop resizing method, but the scope has already surpassed what I expected.