For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download Easy Flat GUI Pack for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Easy Flat GUI Pack v1.9
Easy Flat GUI Pack is a customizable, mobile-friendly game UI pack containing many elements that can be used to create a complete game with a nice flat look.
– WEB DEMO –
Features:
• Layered Photoshop .psd mockups included.
• Layered .SVG vector icons included.
• Mobile-friendly. Can be used in portrait and landscape orientations interchangeably.
• Easily-customizable sizes through 9-sliced buttons and backgrounds.
• Includes demo project showcasing how the contents of this pack can be used in a real-world project with full C# source code.