Bootstrap5 , CSS3 and javascript in sapari browser not working

I am making a website using hugo generator in this website i am using bootstrap5 and CSS3 for styling and structuring and javascript for functionality but this website is fine when we run on google chrome , firefox, microsoft edge etc but when we run this website on sapari browser then disturb the website styling functionality

In sapari

In firefox

Github Repo : https://github.com/hakimullah-cs/hello.git

i will try more apptoaches like webkit hack etc links etc but not correct appriach to gained to solve this problem