Re: Change width of column BP-Default theme
are made within the new folder by copying the default files and altering them?
Yes and no. You can approach things in a few ways – first, and as I’ve seen that you have done, is to inherit the original files then you could add further styles after the @import statements as I’ve shown one post above.
you can copy ALL _inc/css/*.css files to your theme and edit them directly then your @import path would be simply (_inc/css/default.css)
This does mean that if the BP default theme is updated and changes made to the themes CSS your theme will not get them.
Lastly use nufink and do it all oneself 
big job, long time!
