Removing border around banner

Try using Firefox with the Firebug add-on for this kind of CSS work.
https://getfirebug.com/

ya , I always use firebug . But this time I was not able to find the right line to edit.

Hi guy!
I use firebug and see at layout tab then i find this line:
#masthead hgroup{
border:10px solid #…..
}

Thanks kevindng
I realized where I went wrong . The theme has 3 CSS skins that does’nt show up in Appearance -> editor . So i had to go to the raw files to edit.
Thanks