SEO: CSS Error , CSS Warning

Hello to all,

http://www.spazioespositivo.it this site is free of modifications, uses the template based OpenCart and does not have many products, or other.

The problem is that in trying to improve aspects of SEO, I found that there are some CSS errors and many warnings CSS.

Why if it is the standard theme?

How can we reduce?

Thank you.
Luigi

if you were a web developer you would realize that not all browsers support the standard css tags. stop posting things in the bug section if you don't understand about these things.

I'm sorry,
mine was just a simple question.
Since I loaded the site with the standard theme without making any changes and the fact that, with regard to the standard, use the validator international validator.w3.org which encountered several problems, I posted the question to see if someone, somehow, he had never bothered to fix these errors.

That's it.

I'm sorry I have the wrong section.

You can still answer to see if there is a way to fix these errors in part, on the understanding that the site still work?

Thank you.

Have a nice day.

Daniel wrote:if you were a web developer you would realize that not all browsers support the standard css tags. stop posting things in the bug section if you don't understand about these things.

If you were a front-end developer you would know how to write valid html/css. Stop posting these comments if you don't understand about these things.

Despite of the somewhat rude answer of David, he has a point. Sometimes you make choices in favor of functionality instead of validation. Besides validation warnings are the least of your concern for SEO. Have a look in some of the topics discussing SEO; the are a lot of tips to be found.