I'm a bit hesitant to change this as I'm using the GitHub site generator for convenience. There is a limited set of templates available, most of which are either ugly or have readability issues. As the website basically only consists of the README file, you can also look at the GitHub project for more information (https://github.com/remie/YouTransfer)
I'm having a little trouble, too. Even making the type a little bit darker would help.