Answers for "add bootstrap jquery"

roll back last commit in git

git reset --soft HEAD~1

get back some commits git

git revert {commit_id}'

how to revert branch to old commit

git revert --no-commit 0766c053..HEAD
git commit

bootstrap cdn

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