nav#top {
    width: 100%;
    background-color: firebrick;
    display: flex;
    justify-content: space-between;
    align-items: center;

    ul {
	display: flex;
	flex-wrap: wrap;
	list-style-type: none;
	padding: 0;
	margin: 0;
    }

    li {
	padding: 12px 0;
    }

    a {
	padding: 12px;
	color: white;
	text-decoration: none;
    }

    a:hover {
	background-color: tomato;
    }

    #authentication {
	display: flex;
	flex-wrap: wrap;
	justify-content: right;
    }

    button {
	margin: 0.5rem 0.5rem 0.5rem 0;
    }
}