This happens when you have a merge conflict between two commits in your git repository.
You can either use a mergetool, or you can manually delete these instances (if your editor allows for search and replace, search for instances of <<<<<<< HEAD
and >>>>>>> master
to delete them)
In your example, I can see there you have a duplicate code here -
<<<<<<< HEAD
.span9{style: 'margin-top: 50px;'}
=======
.span9
>>>>>>> master
You have to decide if your wan .span9{style: 'margin-top: 50px;'}
or if you want .span9
(I am assuming you have more css definitions below that). And delete the other option accordingly. ======
should also be removed.
Once you have made your decision, you should run
git status
which will show you that you have updated this particular css file and chances are you will also have a .orig
copy of this file created by git. Delete the .orig
file, and git add/commit to complete your merge conflict resolution.