JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="navigation_top">
    <ul>
        <li><a href="#">Btn_1</a></li>
        <li><a href="#">Btn_2</a></li>
        <li><a href="#">Btn_3</a></li>
        <li><a href="#">Btn_4</a></li>
        <li><a href="#">Btn_5</a></li>
    </ul>
    </div>
    
    <div class="navigation_side">
       <ul>        
          <li><a href="#slice1" id="btn_1" class="anchorLink">slice1</a></li>
          <li><a href="#slice2" id="btn_2" class="anchorLink">slice2</a></li>
          <li><a href="#slice3" id="btn_3" class="anchorLink">slice3</a></li>
          <li><a href="#slice4" id="btn_4" class="anchorLink">slice4</a></li>
          <li><a href="#slice5" id="btn_5" class="anchorLink">slice5</a></li>
       </ul>
    </div>
    
    <div id="slice1"></div>
    <div id="slice2"></div>
    <div id="slice3"></div>
    <div id="slice4"></div>
    <div id="slice5"></div>
</div>

CSS

html, body {height:100%; color:#FFF;}

ul, ol, li {margin:0px!important; padding:0px!important;}

.wrapper {width:100%; height:100%;}
.navigation_top {width:100%; height:50px; line-height:50px; background-color:#000; opacity:.5; position:fixed;}
.navigation_top ul {list-style:none;}
.navigation_top ul li {float:left; width:100px; text-align:center;}
.navigation_top ul li a {display:block; color:#FFF; text-decoration:none;}



.navigation_side {width:200px; height:auto; position:fixed; background-color:#000; opacity:.5; margin-top:10%;}
.navigation_side ul li a {color:#FFF; text-decoration:none;}


#slice1 {width:100%; height:100%; background:url(http://img405.imageshack.us/img405/6018/image1uii.jpg);}
#slice2 {width:100%; height:100%; background-color:#999;}
#slice3 {width:100%; height:100%; background-color:#888;}
#slice4 {width:100%; height:100%; background-color:#777;}
#slice5 {width:100%; height:100%; background-color:#666;}

JavaScript

jQuery(document).ready(function($) {

    $(".anchorLink").click(function(event){        
        event.preventDefault();
        $('html,body').animate({scrollTop:$(this.hash).offset().top}, 500);
    });

    $('.navigation_top').hide();

    $(window).scroll(function() {
        // the 10 below is the number of pixels down to show the menu
        if ($(this).scrollTop() > 10) $('.navigation_top').show();
        else $('.navigation_top').hide();
    });
});