Offsite CSS Style Sheets

I noticed that there are several CSS styles sheets that link to other URLs, offsite that control look & feel of some of Wappler’s default features.
E.g.,
https://stackpath.bootstrapcdn.com
https://maxcdn.bootstrapcdn.com
https://code.jquery.com

Makes me nervous because my website may display improperly if these CSS links become broken (happened this morning). Is there anyway when building a new website to specify only an attached style sheet is used as primary and to opt for these Wappler pre-made styles from other sites to download their rules to a specified local style sheet? This would avoid any concerns for broken links or sites that are down.