Touchkit table font

Is anybody out there who is able to answer the question : How can I change the font size in a specific table in a Touchkit touchkit appliaction ?
As far as I know the Touchkit is using the built-in touchkit theme. How can I amend it like in the normal vaadin desktop ?
Let us say in case of a button.
@import “…/valo/valo.scss”;

@mixin mytheme {
@include valo;

// Insert your own theme rules here
.v-button {
color: #fff;
background-color: #4455aa;
border: 1px solid #4455aa;
text-shadow:2px 2px 0px #474746;
height: 50px;
font-family:Trebuchet MS;
font-weight: bold;