How can I remove unwanted line as in the picture below(red rectangle).
This is a bug with certain versions of IE, see http://moodle.org/mod/forum/discuss.php?d=130035
You might have a look at some of the relevant forum discussions to see if there's a solution to your problem: http://moodle.org/mod/forum/search.php?notwords=Re:&id=5&subject=custom+corners
hth
Frank
You might have a look at some of the relevant forum discussions to see if there's a solution to your problem: http://moodle.org/mod/forum/search.php?notwords=Re:&id=5&subject=custom+corners
hth
Frank