change menu border on theme twenty eleven

for these kind of formatting problems, please try to work with a tool such a Firebug https://getfirebug.com/

without a link to your site, nobody will be a ble to make any suggestions.

sorry , I am new to this, my site is: https://donnastampsandsews.com I am thinking of giving up on Twenty eleven even with the child theme, I hate that Black bar, If I change will I loose what I have on there now.
Thanks
Donna