$theme.panel {

background: transparent;

.panel-background {
  position: absolute;
  left: -15px;
  top: -15px;
  bottom: -15px;
  right: -15px;

  @include slices("panel.png", $top: 25, $left: 25, $right: 25, $bottom: 25, $fill: 1 1);
}

}