For a riddle site, I think the site should look more fun with a background color and brighter colors. The header font also needs work.
There is too much red color on your site which is hard to read, it may be a good idea to change the red color to another one somewhere, and there is too much empty space in your header which may be filled with a link to the random riddle.
love your Header You have not used the space, there is more empty space in your site, make the site little colorful too as it is a riddle site