Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Modern & Clean GUI Free.
Modern & Clean GUI v1.5
VERSION 1.5 NOW WITH ROUNDED THEME. +40 New art assets Modern & Clean GUI skin is perfect for today’s minimalist aesthetics. Clutter free styling and simple iconography make for a sleek and impressive UI that is easy to navigate.
The style is genre agnostic meaning it can work in several genres from Sci fi, modern FPS or even fantasy.
The graphics supplied here are only sliced PNG and full PSD files.
PLUS! INCLUDES A FULL MMO/FPS style HUD
Please note that the font used here is not included due to licensing issues. Similar fonts can be found on google fonts.