.toolbar-icon-system-admin-openy-digital-signage:before {
  background-image: url(../images/digital-signage-icon-inactive.png);
}

.toolbar-icon-system-admin-openy-digital-signage:active:before,
.toolbar-icon-system-admin-openy-digital-signage.is-active:before {
  background-image: url(../images/digital-signage-icon.png);
}