How to use it:
In stylish select somewhere "create new style",
Press the "write new style" button,
Copy this css contents to the code section,
Tell this to apply to all urls starting with
Click the save button.
What it does so far:
removes the problem graphs section,
removes the "show round overview" toggle,
reduces the height of all buttons,
makes the section with problems scrollable.
I didn't manage to find out how to make the width of problems columns less so that everyone could see when a round contains 4 problems, not 3. Feel free to comment how to do it if you know (or suggest some other modifications).
And some gifs related.
I hope that I didn't break something (like accidentally hide the questions button or something), but I'm not sure, so use it at your own risk. I've tested it only in firefox, but it should seem that this must work everywhere (like come on, it's just a css modification).