publik-base-theme/static/includes/_a11y.scss

#nav-skip {
	position: absolute;
	top: 0;
	width: 10em;
	ul, li {
		list-style: none;
		margin: 0;
		padding: 0;
	}
}

#nav-skip a {
	position: absolute;
	left: -7000px;
	z-index: 100;
	&:focus {
		left: 0;
	}
}