body {
    /* fallback */
    height: 100vh;
    height: 100dvh;
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
        url('https://images.unsplash.com/photo-1559521783-1d1599583485?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1950&q=80');
    background-size: cover;
    background-position: center;
    text-shadow: 0 0.05rem 0.1rem rgba(0, 0, 0, 0.5);
    box-shadow: inset 0 0 5rem rgba(0, 0, 0, 0.5);
}

.alert {
    text-shadow: none;
}

.nav-link {
    padding: 0.25rem 0;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    margin-left: 1rem;
    border-bottom: 0.25rem solid transparent;
}

.nav-link:hover {
    color: rgba(255, 255, 255, 0.5);
    border-bottom-color: rgba(255, 255, 255, 0.5);
}

.nav-link.active {
    color: white;
    border-bottom-color: white;
}