Dear Glutton for Punishment,
Stylish for Firefox and Chrome allow for custom Cascading StyleSheets (CSS) on specified websites. Based on this and some CSS I wrote a while ago, I present
Tumblr && Trolltype
…it’s a first draft, and there are some things that simply won’t work due to the way tumblr codes things (like fanmail). Things are read right to left, which may make you dash do… interesting things.
There may not be another draft.
So, there you go.
(If you didn’t mean “your dashboard”, check out the Usage page)