Add hover to key
Add hover to key

Hover on the main element. #52

thfield/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,jamestyack/somerville-teacher-tool,jhilde/studentinsights,codeforamerica/somerville-teacher-tool,studentinsights/studentinsights,hunterowens/somerville-teacher-tool,jamestyack/somerville-teacher-tool,studentinsights/studentinsights,erose/studentinsights,thfield/somerville-teacher-tool,jamestyack/somerville-teacher-tool,thfield/somerville-teacher-tool,jhilde/studentinsights,hunterowens/somerville-teacher-tool,jhilde/studentinsights,studentinsights/studentinsights,codeforamerica/somerville-teacher-tool,erose/studentinsights,jhilde/studentinsights,erose/studentinsights,studentinsights/studentinsights,erose/studentinsights,hunterowens/somerville-teacher-tool