The progress bar class has a size parameter which defaults to 500. There is nowhere in Moodle code that uses any value other than 500 for this parameter.

There are two problems:

1. The progress bar is centered slightly incorrectly because the size it uses does not take into account 2 pixels of border (i.e. something should be 502, not 500).

2. The width value is ignored at the key point, meaning the width option doesn't actually change the width of the bar. This seems like rather a flaw in the width option.