First of all please fix the typos for bootstrap :) Both your title and the content have it with the wrong spelling. Using the right word will help other people find your question and the correct answer easier.
To your question:
TLDR: include bootstrap css first, then override the unwanted spec in your own css files.
Explanation:
Last included css file has the highest priority in CSS. See:
Order of prioritization when using multiple contradictory css files
Meaning, if there are multiple files matching to the same specificity (same type, class, id etc.), the last file included will control the change.
In general, you want to include library files like bootstrap the first; then, you need to include your own css files (generally style.css or main.css). In your files, you can override whatever you didn't like from bootstrap.