W3C CSS Validation Errors & Warnings

Hi I purchased your html canvas template recently and I purchased it because its shows zero w3c css errors for demos you have but unfortunately when I purchased your html canvas template and migrate my website content using canvas template it shows w3c errors and warnings. The errors and warnings are in following styleshseets

1. theme style.css (I do nothing with this it is same as package)
2. Bootstrap core bootstrap.css
3. animate.css
4. magnific.css
5. font-icons.css
6. dark.css
7. select.css
8. swiper.css
9. responsive.css
   10)colors.css

and long list

Total errors 35
total warnings 1536

Below is website with erros and warnings plz check

https://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Fwww.brokenheartcbtcure.com%2Findex.html&profile=css3svg&usermedium=all&warning=1&vextwarning=&lang=en

Please guide me how to override these errors and warnings. I checked your theme demos and it contains zero error and warnings.

Thanks looking forward for quick response and solution.