Feedback text goes right out of boarder.Is it a problem of quiz or theme?
This is almost certainly a problem with the theme. Which browser are you using? If it happens in Firefox, can you use Dom inspector to investigate what is going on.
Basically, if it is a CSS problem, it is a theme thing. If it is a HTML problem, it is a question type problem.
The problem happens only with IE. I found that IE 6 and 7 break it. I tried it with formal white and standard and got the same results.
Attached is the file.
I can reproduce this in Moodle 1.7.2+
And someone has already fixed this bug in Moodle 1.8 and later.
I've back-ported the fix, and cleaned up the CSS in all versions.