.navbar {
  width: 100%;
}
.hero.banner-bg {
  background-image: url(../images/banner.jpg);
  background-size: 100%;
  background-repeat: no-repeat;
  height: 480px;
  background-position: 50% 50%;
  color: white;
}

.banner-bg.aboutus-bg {
  background-image: url(../images/aboutus-banner.jpg);
}

.banner-bg.product-bg {
  background-image: url(../images/product-bg.jpg);
}

.banner-bg.contact-bg {
  background-image: url(../images/contact-banner.jpg);
}

.button a {
  color: #ffffff;
}