section.promo-bg {
  background-image: url(img/phone-detail-background.png) !important;
}

section.promo-bg .btn-primary{
  background-color:blue;
}

section.promo-bg .onSale:before {
  background-image: url('img/tags-phone-pages-green.png');
}

div.promo-bg.onSale:before {
  background-image: url('img/tags-phone-pages-green.png');
}