html, body {
    background: #030303;
}

.intro {
    width: 100%;
    height: calc(100vh);
    background: url('https://homeiswhereyourbagis.com/wp-content/uploads/2019/11/Freiburg-Bermudadreieck-1024x576.jpg') no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

.navbar {
    background: #000;
    color: #fff;
}

.navbar-brand {
    color: #fff;
    font-size: 2em;
}

.navbar-brand:hover {
    color: #fff;
}