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              <nav class="nav">
  <ul class="nav__list">
    <li class="nav__item">
      <a class="nav__link is-active" href="#dashboard">Dashboard</a>
    </li>
    <li class="nav__item">
      <a class="nav__link" href="#lorem">Lorem</a>
    </li>
    <li class="nav__item">
      <a class="nav__link" href="#dolor">Doloripsumdot</a>
    </li>
    <li class="nav__item">
      <a class="nav__link" href="#thing">Thing</a>
    </li>
    <li class="nav__item">
      <a class="nav__link" href="#other-thing">Other Thing</a>
    </li>
  </ul>
  <div class="nav__shadow nav__shadow--start"></div>
  <div class="nav__shadow nav__shadow--end"></div>
</nav>

<div id="dashboard" class="container page is-active">
  <h1>Dashboard</h1>
  <h2><a href="#lorem">Lorem</a></h2>
  <p>Lorem Ipsum</p>
  <hr>
  
  <h2><a href="#dolor">Doloripsumdot</a></h2>
  <p>Lorem Ipsum</p>
  <hr>
  
  <h2><a href="#thing">Thing</a></h2>
  <p>Lorem Ipsum</p>
  <hr>
  
  <h2><a href="#other-thing">Other Thing</a></h2>
  <p>Lorem Ipsum</p>
</div>

<div id="lorem" class="container page">
  <h1>Lorem</h1>
</div>

<div id="dolor" class="container page">
  <h1>Doloripsumdot</h1>
</div>

<div id="thing" class="container page">
  <h1>Thing</h1>
</div>

<div id="other-thing" class="container page">
  <h1>Other thing</h1>
</div>

            
          
!
            
              $nav-height: 3em;
$nav-scrollbar-height: 1.5em;
$nav-shadow-width: 4.5em;

.nav {
  position: relative;
  height: $nav-height;
  display: flex;
  align-items: center;

  @media (pointer: coarse) {
    // Hide the scrollbar on devices with touch input.
    overflow: hidden;
  }
}

.nav__list {
  position: relative;
  display: flex;
  margin-left: 1em;
  margin-right: 1em;
  padding: 0;
  align-items: center;
  list-style-type: none;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;

  @media (pointer: coarse) {
    // Move the scrollbar outside of the visible area
    // by making the element taller than the parent element.
    height: $nav-height + $nav-scrollbar-height;
  }
}

.nav__item {
  flex-shrink: 0;
  
  &:not(:first-child) {
    margin-left: 1em;
  }
}

.nav__link {
  display: inline-flex;
  height: $nav-height;
  align-items: center;
  text-decoration: none;
  
  &.is-active {
    font-weight: bold;
  }
}

.nav__shadow {
  width: $nav-shadow-width;
  height: $nav-height;
  position: absolute;
  top: 0;
  // Using 0% rgba value instead of transparent because of Safari.
  background: linear-gradient(to right, rgba(#fff, 0), #fff 80%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s;
  
  &.is-visible {
    opacity: 1;
  }
}

.nav__shadow--start {
  left: 0;
  transform: rotate(180deg);
}

.nav__shadow--end {
  right: 0;
}

.page {
  display: none;
  
  &.is-active {
    display: block;
  }
}

.container {
  padding-right: 1em;
  padding-left: 1em;
}

body {
  background: #fff;
  margin: 2em auto;
  width: 20em;
  padding-top: 1em;
  padding-bottom: 1em;
  border: 0.25em solid #444;
  border-radius: 1em;
}

hr {
  margin-top: 1em;
  margin-bottom: 1em;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
            
          
!
            
              const $navList = document.querySelector('.nav__list');
const $body = document.querySelector('body');
const $shadowStart = document.querySelector('.nav__shadow--start');
const $shadowEnd = document.querySelector('.nav__shadow--end');

function activatePage($page) {
  const $activePage = document.querySelector('.page.is-active');
  
  if ($activePage) {
    $activePage.classList.remove('is-active');
  }
  
  $page.classList.add('is-active');
}

function activateItem($item, $container) {
  const href = $item.getAttribute('href');
  const $navItem = $container.querySelector(`[href="${href}"]`);
  const $activeItem = $container.querySelector('a.is-active');
  const $page = document.querySelector(href);
  
  if ($activeItem) {
    $activeItem.classList.remove('is-active');
  }
  
  $navItem.classList.add('is-active');

  activatePage($page);
}

function handleShadowVisibility() {
  const maxScrollStartReached = $navList.scrollLeft <= 0;
  const maxScrollEndReached = $navList.scrollLeft >= $navList.scrollWidth - $navList.offsetWidth;

  toggleShadow($shadowStart, maxScrollStartReached);
  toggleShadow($shadowEnd, maxScrollEndReached);
}

function toggleShadow($el, maxScrollReached) {
  const shadowIsVisible = $el.classList.contains('is-visible');
  const showShadow = !maxScrollReached && !shadowIsVisible;
  const hideShadow = maxScrollReached && shadowIsVisible;

  // Using requestAnimationFrame for optimal scroll performance.
  // https://stackoverflow.com/a/44779316
  if (showShadow) {
    window.requestAnimationFrame(() => $el.classList.add('is-visible'));
  } else if (hideShadow) {
    window.requestAnimationFrame(() => $el.classList.remove('is-visible'));
  }
}

$navList.addEventListener('scroll', (e) => handleShadowVisibility(e));

$body.addEventListener('click', (e) => {
  const $target = e.target;
  const isLink = $target.getAttribute('href').indexOf('#') === 0;
  
  if (isLink) {
    e.preventDefault();
    activateItem($target, $navList);
  }
});

handleShadowVisibility();

            
          
!
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