div {height: calc(-0.5 * var(ei-table-cell-padding));
  width: -webkit-calc
(100% + 20px);
  margin: -moz-calc(
100%
-
320px
);
  background: url(
    var( audience-network-checkbox-image)
    ) center no-repeat;
  background-image: url(
    )
    center center
    no-repeat
    black;}