1. Got it. We'll set a background color in the body.
2. I agree. We will think about ways to handle it. As a last resort we may blacklist those kind of publishers.
3. Sign in is only needed to favorite stories (using the little bookmark icon below each line). I agree that it is not clear what the sign in is for, we will fix that.
4. Yup, we will increase the contrast a little.
Thanks for the feedaback!