article > header > nav {
    margin: 0 auto;

    ul {
	list-style: none;
	margin: 1rem auto;
	padding: 0;
	display: flex;
	width: 100%;

	li {
	    margin: 0 auto;
	    padding: 0.5rem;
	    flex: 1;
	    text-align: center;
	    border: 1px solid;
	    width: 12rem;

	    a {
		display: inline-block;
		position: relative;
		width: 100%;
		height: 100%;
	    }
	}
    }
}

body.txt article > header > nav a {
    background-color: $bg-txt-on;
}