I took the CSS Gradient generator that @Kundanaks made(I used an improved UI version by @JackPike) and put it into an extensions. The URL(For extension loading) is here: https://gradient-generator.bedrockminer.repl.co
Nice bro!What is thing 
Hey @Kundanaks welcome to the forums!
Extensions are Repls that can be run in your Repl. You can go to the Marketplace and download extensions (for free currently) and use them, they can make life easier, they can have fun things to do, or just added flair.