website to mobile website

[Irvilne]

folks!The problem: is next, my task is to migrate from existing version of website to mobile one, or create a support for mobile devices.What I have got: a complete website, with single, main CSS style sheet. It is applied to every single page of the website and website have many products, which means - many pages.My question: How to change the markup, in order to affect every single page?What should I start changing? Should I apply changes to the existing CSS cause it is bind with the existing HTML markup, or maybe better to add more CSS rules and HTML tags, for making it more responsive? I am not sure how to go around this, cause if I start adding more CSS and HTML, that means I have to change the existing CSS. At the end of the day my task is to create a support for mobile devices. Any advice would be very helpful, Thanks.I am new to developing ASP.NET websites, and using Visual Studio. Although I have used Dreamweaver CS6 before. When I were using CS6 I have been applying changes to template layout and then I had to update other pages, either by find and replace or upgrade a template, sometimes manually. It was a heck of a job, though.So what I think is to use some framework that enables me to create a responsive layout website. And for that I need to add such elements into HTML markup as , .Thanks a lot for reading this short story!