nav {
    order: 3;
}

header .social {
order: 2;
}

nav ul {
    display: none;
    background-color: black;
    color: white;
    width: 100%;
    left: 0;
    margin-top: 54px;
    min-height: calc(100vh - 54px);
    position: absolute;
}
nav a {
    width: 100%;
}

nav li a:active {
    filter:brightness(60%)
}