You're Desktop site looks good, but your Tablet and Mobile are not showing up nice. It's easier to start Mobile first and then apply CSS exceptions for Tablet and Desktop. https://zellwk.com/blog/how-to-write-mobile-first-css/
Thanks Drallas for your review, I am still new to the development and still learning as I found it is my passion. I know that I did not touch mobile compatibility yet but I will update the design soon. Hope after that you can give it another review and advise if you found any thing.