hugo-theme/layouts/partials/footer.html

			<footer>
				<hr/>
				<a href="/{{ .Language.LanguageCode }}">{{ .Site.Title }}</a><br/>
			</footer>

<script>
  // JavaScript to check if content is shorter than the screen
  // and add fixed class to footer if needed
  window.addEventListener('DOMContentLoaded', function() {
    var content = document.querySelector('.content');
    var footer = document.querySelector('footer');
    
    if (content.offsetHeight < window.innerHeight) {
      footer.classList.add('fixed');
    }
  });
    </script>
	</body>
</html>