Center content vertically on Vuetify

Is there a way to center content vertically in Vuetify?

With the text-xs-center helper class, the content gets centered horizontally only:

<v-container grid-list-md text-xs-center>
  <v-layout row wrap>
     <v-flex xs12>
       Hello
     </v-flex>
  </v-layout>

From the API, I tested some other helper classes such as align-content-center but did not achieve the result.