body {
    color: green;
}
.navbar-nav .nav-link {
    color: green;
    border: 2px solid green;
    margin: 5px;
    padding: 5px 15px;
}
.navbar-brand img {
    max-width: 150px;
}
.navbar-toggler-icon {
    border: 2px solid black;
    background-color: grey;
}