fix(MdCard): prevent showing scrollbars (#1580)

Author: Samuell1

src/components/MdCard/base.scss

@@ -5,7 +5,6 @@ $md-card-radius: 2px;
 
 @mixin md-card () {
   @include md-elevation(2);
-  overflow: auto;
   position: relative;
   z-index: 1;
   border-radius: $md-card-radius;