Replicate login form html/css style into ruby/rails web app

We are looking for a designer/developer to replicate the [login to view URL] form into our web application. We currently have a login and sign up form. We would like it to look like the login form that linkedin uses at the above url. The proportions and dimensions must remain the same. We will provide you with our logo to use instead of the linked in logo. Familiarity with rails is a plus, as our web application is written in rails. This will allow quicker integration and editing of our current html/css to make it look like that login. Login form must act the same way when the screen size is small. You must have a github account and be familiar with git. Background on us: We are a start up that's building tools for information organization, feedback, and collaboration in the enterprise.