What can be used in place of mdl-cell--0-col-phone to either disable an element or make its width zero?
<div className="mdl-grid">
<div className="mdl-cell mdl-cell--2-col-phone mdl-cell--2-col-tablet mdl-cell--2-col-desktop">
<LeftContent/>
</div>
<div className="mdl-cell mdl-cell--0-col-phone mdl-cell--4-col-tablet mdl-cell--8-col-desktop">
<!-- no content -->
</div>
<div className="mdl-cell mdl-cell--2-col-phone mdl-cell--2-col-tablet mdl-cell--2-col-desktop">
<RightContent/>
</div>
</div>