CLC-2265 My Classes subtitles don't match the design spec

https://jira.media.berkeley.edu/jira/browse/CLC-2265

The omnigraffle specs the subtitles to be as follows:

color: #fff or $cc-color-white
font-size: 12px
font-weight: normal
padding: 2px 16px

background color: #6e7a83

I left the background as-is because we already have lots of greys and the existing one is in use in several other places already