[no-jira] Applied instructure styling to engagement index

@christianv Sure I can do that, but I am not sure I fully understand how to do this yet. I'm consistently hit with Sass::SyntaxError when I change the current gradient styling into SASS syntax format. 

I tried changing it to ##+linear-gradient(to bottom, #5bc0de, #2596b8);##, per the compass-style documentation. Is there something I am missing here?