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HTML

              
                <body>
		<header>
			<nav>	<!-- Navigation link divs   -->
				<ul class="navbar">
					<li id="redlink" onclick="PAGE.switchPage('redlink')" class="link on">
						RED
					</li>
					
					<li id="whitelink" onclick="PAGE.switchPage('whitelink')" class="link">
							WHITE
					</li>
					
					<li id="bluelink" onclick="PAGE.switchPage('bluelink')" class="link">BLUE
					</li> 
          
				</ul>
        
			</nav>
		
		</header>
		
		<article>
			<section id="redpage" class="redpage band">
        THIS IS RED PAGE FULL OF STUFF
			</section> 
			<section id="whitepage" class="whitepage band hidden">
				THIS IS WHITE PAGE FULL OF STUFF
			</section> 
			<section id="bluepage" class="bluepage band hidden">
				THIS IS BLUE PAGE FULL OF STUFF
			</section> 
		</article>
		
    <footer>
      <div class="foot-cont">Oh . . . What An Awful Footer !
      </div>
    </footer>
	</body>
              
            
!

CSS

              
                body{
	text-align: center; 
	margin: 0 auto;
	font-family: Open Sans, sans-serif;
	font-size: 1.4rem;
	color: #000; 
	background-color: orange;
}

header{
	display: flex;
  flex-flow: row wrap;
  justify-content: flex-end;
  align-items: center;
  align-content: center;
	width: 95%;
	height: 100px;
	font-weight: bold;
	text-align: left;
}

nav{
	display: block;
	width: 65%;
	height: 40px;
	text-align: right;
} 

.navbar{
	display: flex;
  flex-flow: row wrap;
  justify-content: flex-end;
  align-items: center;
  align-content: center;
	height: 40px;
	list-style-type: none;
	text-align: justify;
	font-size: 1.4rem;
	margin: 0;
	padding: 0;
}

.cont{
}

nav li{
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
	padding: 0;
	width: auto;
  margin-left: 10%;
	height: 40px;
	font-weight: bold;
	line-height: 40px;
	text-align: center;
	color: #FFFFFF;
  cursor: pointer;
}

nav li::after {
    position: absolute;
    display: block;
    background-color: #00FFFF;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    content: '';
    height: 2px;
    width: 0;
    opacity: 0;
    transition: height 1000ms, opacity 1000ms, width 1000ms;
}

nav li:not(.on):hover::after {
    width: 100%;
    height: 3px;
    opacity: 1;
}

.link {
	color: #FFFFFF;
	text-decoration: none !important;
	cursor: pointer;
} 

.on::after {
  height: 3px;
  opacity: 1;
}

.on:hover{
	cursor: none;
	pointer-effects: none;
}


article{
  width: 95%;
  margin: 0 auto;
}

.band{
	height: 800px;
  font-weight: 600;
  font-size: 4rem;
  color: gold;
  text-align: center;
  display: flex;
  justify-content: center; /* align horizontal */
  align-items: center; /* align vertical */
  
}

.hidden{
	display: none;
}

.redpage{
	background-color: #FF0000;
}

.whitepage{
	background-color: #FFFFFF;
}

.bluepage{
	background-color: #0000FF;
}

footer{
  margin: 0 auto;
  width: 95%;
  text-align: center;
  background: #000;
}

.foot-cont{
  height: 100px;
  font-size: 1.4rem;
  font-style: italic;
  color: #FFF;
  display: flex;           /* Important here, heh-heh */
  justify-content: center; /* align horizontal */
  align-items: center; /* align vertical */
}
              
            
!

JS

              
                const PAGE = ( () =>
{
  const switchPage = (pagelink) =>
  {
    const onLink = document.getElementsByClassName("on")[0];			    // Find current nav link element
    const oldPageId = (onLink.id).substring(0,                        // Get id of corresponding page ...
                          (onLink.id).length - 4) + "page";		        // ... by replace "link" with "page" 
    const newPageLink = document.getElementById(pagelink);				    // Find new nav link, i.e. link clicked on
    const newPageId = (newPageLink.id).substring(0, 
                          (newPageLink.id).length - 4) + "page";	    // Deduce id of corresponding page
    if (oldPageId != newPageId)																		    // Only reload when clicking on different page
    {
      onLink.classList.remove("on");															    // Remove active status from old nav link
      newPageLink.classList.add("on");														    // Show new nav link as active page
      document.getElementById(oldPageId).classList.add("hidden");	    // Hide old page content
      document.getElementById(newPageId).classList.remove("hidden");	// Display current page content
    }
  }
  
  return { switchPage: switchPage };
  
}) ();
              
            
!
999px

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