<header>
	<h1 class="fixed-top">
			Logo or Main Nav Bar
	</h1>
</header>
<div class="toc">
  <h2 id="one" class="section">Heading 1</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <h2 id="two" class="section">Heading 2</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <h2 id="three" class="section">Heading 3</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <h2 id="four" class="section">Heading 4</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>

body {
  background-color: #000;
  color: #fff;
  padding-left: 1rem;
  padding-right: 1rem;
  margin: 0;
  height: 800px;
}

a {
  text-decoration: none;
}

.scrollmenu a {
  display: inline-block;
  color: inherit;
  text-align: center;
  padding: 14px;
  text-decoration: none;
}

a.active {
  text-decoration: underline;
}
  
#nav {
  position: fixed;
  overflow-x: scroll;
  top: 50px;
  right: 0;
  left: 0;
  opacity: 0;
  padding-left: var(--mp-3) !important;
  padding-right: var(--mp-3) !important;
  transition: opacity 0.1s;
  -webkit-transition: opacity 0.1s;
}

.section:target::before {
  content: "";
  display: block;
  height: 100px; 
  margin: -100px 0 0; 
}
  
.scrollmenu {
	background-color: #0dc6c1;
	display: block;
	position: sticky;
	top: 0;
	overflow: auto;
	white-space: nowrap;
  color: white;
  font-family: Courier;
}

.fixed-top {
	position: fixed;
	z-index: 1030;
  top: 0;
  left: 0;
  right: 0;
}

h1 {
  background-color: #000;
  width: 100%;
  padding-left: 1rem;
  padding-top:.5rem;
  padding-bottom: .5rem;
}

h1, h2 {
  font-family: Courier;
  margin-block-start: 0;
  margin-block-end: 0;
}

.toc {
  margin-top: 8rem;
}

p {
  font-family: Arial;
}

// Create Table of Contents
function createTableofContents() {
	var ToC =
		"<aside id='nav'><nav class='scrollmenu'>";

		var newLine, el, title, link;

		$(".toc h2").each(function() {
		el = $(this);
		title = el.text();
		link = "#" + el.attr("id");

		newLine =
			
			"<a class='anchor' href='" + link + "'>" +
				title +
			"</a>";

		ToC += newLine;

		});

		ToC +=
		"</nav></aside>";

		$(".toc").prepend(ToC);
}

// show table of contents after scrolling more than 30px
function showTOC() {
	$(window).on('scroll', function() {
    var scrollPosition = $(this).scrollTop();
    if (scrollPosition >= 30) {
        $('#nav').css('opacity', '1');
    }
  });
}

// highlight (with an underline) the subnav menu item as you scroll to it
function highlightActiveItem() {
		$('#nav nav a').on('click', function(event) {
			$(this).parent().find('a').removeClass('active');
			$(this).addClass('active');
		});

		$(window).on('scroll', function() {
			$('.section').each(function() {
				if($(window).scrollTop() + 100 >= $(this).offset().top - $(".scrollmenu").height() ) {
					var id = $(this).attr('id');
					$('#nav nav a').removeClass('active');
					$('#nav nav a[href=\\#'+ id +']').addClass('active');
				}
			});
		});
}

createTableofContents();
showTOC();
highlightActiveItem();