Summary chart CSS fixes

The charts on the summary page were a little out of whack, so I adjusts them the best I could with margins and other CSS magic.  Jeff approved the screencap I attached on the jira ticket. https://internal.cida.usgs.gov/jira/browse/NAWQAAN-381

Also fixed the popup for benchmarks fighting with the nav issue I noticed with a little z-index.  
Third vote for moving it here.