the first app guide  is missing .home and .blog styles.
i know they can be copied from the getting_started example in the sdk directory, but i'd liked it better if the guide also showed how to compile this stylesheet, because i'm new to the compass/ sass thingies.
the compass/ sass way to add the missing style to your getting_started app, is:
copy the .home and .blog rules from the getting_started example in the sdk directory (touch-2.3.1/examples/getting_started/resources/sass/app.scss) to app.scss in your app directory (<getting_started_app>/resources/sass/app.scss) and save the file.
open a Sencha Cmd shell in the root of your <getting_started_app> and run: sencha compass compile resources/sass
this wil rebuild - and overwrite - your app's stylesheet (<getting_started_app>/resources/css/app.css), with the .home and .blog rules added.