Issue #197 Responsive Style directive should merge with default inline style:
<div fxFlexFill
    style="font-size:10px; color:black; text-align:'left';"
    [ngStyle.sm]="{'font-size':'16px', color:#a63db8, text-align:'center' }"
    ngStyle.md="font-size:24px; color:#00f;" text-align:'right'>
</div>