Convert a website to responsive design -- 2

I need to transition a website to use responsive design. Here's the website in question: [login to view URL] Basically, any page a signed-out user can access needs to be responsive. There's some very small mobile-specific tweaks, but for the most part the site just needs typical responsive design implemented. Two tasks: Implement responsive changes that make the website responsive and look good on laptop, tablet, mobile devices. The mobile navigation menu should be a hamburger menu. There's only a few unique page templates, so the scope of work here is pretty small. If you take a look at the page resources you'll notice a mix of folders, but the only ones that we are really concerned about are the main stylesheet and the menu stylesheet. - You can pack most of the CSS changes in the main stylesheet: wp-content/themes/default/style.css. - There's also a stylesheet for the menu in css/[login to view URL] Specific notes for the pages that use a sidebar in responsive mode: We will show a condensed version of the ad "Stay Inspired" on mobile. On responsive, the ad should display closer to the top of the page. Since the sidebar will be below the page content on mobile, you will need to conditionally include this ad near the top of the page instead of the top of the sidebar.