Why is my blog theme rejected

you can examine this link talha-durak.com

No proper use of colors and paddings, texts have some weird effect on page load (take a look at menu items and search box), none of the menu item link is working, some strange hover effects with no proper padding https://i.vgy.me/6NBfwX.jpg, scroll bar is not visible.

Thank you for help. Can you suggest how to choose the colors