Answers for "google bootstrap library"

git undo merge

$ git reset --hard HEAD~1

git undo merge

git reset --hard HEAD~1

Undo git merge

git reset --merge HEAD~1

git undo merge

git reset --hard HEAD~1
git reset --hard <commit_sha>

revert last merge git

git revert -m 1 commit_hash

bootstrap cdn

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">