body {
    background: url('/fileadmin/images/background-otc.jpg') no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
    -o-background-size: cover;
}

nav {
    background-color: #3883f3;
    color: #ffffff;
}

nav a, .nav-link {
    color: #ffffff;
}

.navbar-brand img{
    width: 100px;
}