Vertical Division in a Material Design Lite Card

I am using Material Design Lite Website Link Here

There is no way whatsoever to make a vertical division in card as per documentation given there.

For Divisions generally grid layout is used in material design but when I am making use of grid then there is by default a space between the two cells. Is there any other way by which I can have vertical divisions without space in a card?

Demo Plunkr

Css

    .grid-handler {
  max-width: 600px;
}

HTML

 <div class="grid-handler mdl-grid">
         <div class="mdl-cell mdl-cell--6-col mdl-card mdl-shadow--2dp">6</div>
         <div class="mdl-cell mdl-cell--6-col mdl-card mdl-shadow--2dp">6</div>
  </div>