body {
    --color-primary: darkgreen;
}

nav ul li {
    list-style: none;
    padding-left: 1em;
}

nav ul li a { 
    color: var(--color-primary);
    text-decoration: none;
}

nav ul {
    display: flex;
    flex-direction: row;
}

.link-tree {
    display: flex;
    flex-direction: row;
    justify-content: center;
    margin: auto;
    max-width: 56rem;
}
.link-tree-item {
    margin: 0.1rem;
    padding: 0.2rem;
    text-align: center;
}

.link-tree-item a {
    color: var(--primary-color);
}