I can validate your code and make it Cross-Browser friendly for $50
HIGH LEVEL OF SECURITY AND PRIVACY
First check your site here and see all errors in HTML structure
http://validator.w3.org
Then check your CSS structure to see if it also has some errors.
https://jigsaw.w3.org/css-validator
If it feels better to give me your information by phone, I can provide my number.
I will deliver the task in one week after I have received all information about your site.