How to change the background and other properties of any bootstrap 3 div? No matter how I tried I will get this error “Making this change would require changing code that is locked by a template or a translator. The change will be discarded.” When I assign ID to the div and make new style for the ID I will receive this error "an unexpected error has occurred while trying to read style-sheet information".

What did I do wrong? Thank you for your help.

Hello Firdaus,
It seems you are trying to edit the bootstrap styles using the CSS Inspector/Panel. Unfortunately this is not possible, as Bootstrap CSS files are locked. If you need to make any changes, add them into a custom CSS file, included on your page, after the bootstrap CSS.

Thank you for your reply Teodor.

I figured that out but and it worked fine but this method doesn't work with Navbar properties. I'm figuring out how to edit "a tag" color of my Navbar. Available themes in Bootswatch are limited. I like the Simplex, but I want the active a tag to be green in color.