.nebula-bg {
    background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('assets/nebula-1.png');
    background-position: center;
    background-size: cover;
}

.light-nebula-bg {
    background-image: linear-gradient(rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.7)), url('assets/nebula-1.png');
    background-position: center;
    background-size: cover;
}