Learning Java... Still Ongoing Process.... :p

I'm on vacation.
A friend asked me if I could work on a freelance web project. I was getting bored of summer vacations so I said yes.
It was a website for online lottery and it was already developed by some freelancers.
Owner wanted more freelancers to revamp design and administration panel.

I looked at the site and knew that I had seen the worst design and code of my life.

Frontend was made of two colors only, black and yellow. Out of both, black was more prominent. Moreover it had nothing related to Js as if it was developed as a challenge to be accomplished without java script.

Admin panel and backend was much worse than that. No security practices and deprecated essential libraries.

The nightmare is about to end as I have inducted a much better design from themeforest for frontend.
Backend is in my homebrew php framework.
(Good luck future freelancers 😆)
I'm positive that next edits will be features additions only and no one will blame my code.

I am on summer vacation and i want to create something interesting ,do u guys have any suggestion
I know
java,html,css,javascript,c++