 <p>I was having this same problem after installing SCSS. I fixed the problem by removing the defult comments that rails places in the header. So this:</p> <pre><code>/* * This is a manifest file that'll be compiled into application.css, which will include all the files * listed below. * * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets, * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path. * * You're free to add application-wide styles to this file and they'll appear at the top of the * compiled file, but it's generally better to create a new file per style scope. * *= require_self *= require_tree . */ #wrapper { width: 980px; margin: 0 auto; } </code></pre> <p>Became this:</p> <pre><code>#wrapper { width: 980px; margin: 0 auto; } </code></pre>