.hero-1 {
    background-image: url('../images/hero_1.jpg');
}
.hero-2 {
    background-image: url('../images/hero_2.jpg');
}
.hero-3 {
    background-image: url('../images/hero_3.jpg');
}

    @media (max-width: 991.98px) {
      .site-menu.main-menu {
        background: #fff;
        padding: 10px 0;
        border-top: 1px solid #eee;
      }
    }
    
    .btn-success {
      background-color: #25D366;
      color: #fff;
      padding: 10px 16px;
      border-radius: 6px;
      text-decoration: none;
      font-weight: 500;
    }
    .btn-success:hover {
      background-color: #1ebe5b;
      color: #fff;
    }