I found the default GUI palette too bright for me and not fitting the rest of my GUI screens (I have a dark UI texture pack) so I decided to recolor yours to a darker version. I am attaching it here, incase you ever want to incorporate it as configurable feature.

uncompressed.zip

Thank you for this texture. I will add it to the mod as an option via resource packs in the next update. Not sure when tho😅