body { padding-top: 70px; }


.hero {
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
              url('/images/hero.png') no-repeat center center;
  background-size: cover;
  height: 100vh; /* Supaya dia penuh satu screen */
}