.hero-bg {
    background: url("/static/images/Home_images/Main-head-background.png") center/cover no-repeat;
    color: #ffffff;
}

.hero-bg .navbar {
    background: transparent;   /* important: no solid color */
}

.hero {
    padding-top: 10em;     /* big space above */
    padding-bottom: 10em;   /* space below */
}