To achieve something similar to the glass style, you'll need to fiddle with the sliders.
For example like this:
https://ibb.co/fzqZVw07
Primary color: {30,30,30,1}
Secondary color: {255,255,255,255}
A complete recreation of the style isn't possible due to how the GUI code is written. I can't round the corners of buttons, I can't add glassy highlights and shimmers, and all that sort of thing.
