I have a custom developed website which runs on ASP.NET platform. I would like to upgrade it to use a responsive design with proper CSS styles and light weight graphics/menu. No fancy features or complex design needed. I am looking for a simple but elegant design.
I use a single Masterpage for all the ASP.NET pages. The goal is to replace this single Masterpage with a new one to replace the full UI of the site.
The changes have to be done step by step and changes have to be applied on live site progressively. This requires active collaboration with me when you are developing the new UI/CSS.