I have a site that sometimes doesn't have much content in the main section of the page. The footer then slides way up. I would like to have a consistent minimum height on all the pages that keeps the footer roughly close to the bottom of the average page. Many of the examples that I have seen radically modify the CSS and that concerns me in relation to keeping the site responsive.
In my example on Bootply I want to have the lime green area expand to "fill" the page from the bottom of the nav area to the top of the footer.