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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="viewport">
  <header class="header" role="banner">
    
    <nav id="nav" class="nav" role="navigation">
      
      <!-- ACTUAL NAVIGATION MENU -->
      <ul class="nav__menu" id="menu" tabindex="-1" aria-label="main navigation" hidden>
        <li class="nav__item"><a href="#" class="nav__link">Home</a></li>
        <li class="nav__item"><a href="#" class="nav__link">Shop</a></li>
        <li class="nav__item"><a href="#" class="nav__link">Blog</a></li>
        <li class="nav__item"><a href="#" class="nav__link">About</a></li>
        <li class="nav__item"><a href="#" class="nav__link">Contact</a></li>
      </ul>
      
      <!-- MENU TOGGLE BUTTON -->
      <a href="#nav" class="nav__toggle" role="button" aria-expanded="false" aria-controls="menu">
        <svg class="menuicon" xmlns="http://www.w3.org/2000/svg" width="50" height="50" viewBox="0 0 50 50">
          <title>Toggle Menu</title>
          <g>
            <line class="menuicon__bar" x1="13" y1="16.5" x2="37" y2="16.5"/>
            <line class="menuicon__bar" x1="13" y1="24.5" x2="37" y2="24.5"/>
            <line class="menuicon__bar" x1="13" y1="24.5" x2="37" y2="24.5"/>
            <line class="menuicon__bar" x1="13" y1="32.5" x2="37" y2="32.5"/>
            <circle class="menuicon__circle" r="23" cx="25" cy="25" />
          </g>
        </svg>
      </a>
      
      <!-- ANIMATED BACKGROUND ELEMENT -->
      <div class="splash"></div>
      
    </nav>
    
  </header>
  
  <!-- DEMO CONTENT -->
  <main class="main" role="main">
    <div class="gallery" aria-label="gallery">
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
      <a href="#" class="gallery__item"></a>
    </div>
  </main>
</div>
            
          
!
            
              // ---------------------------
// Vars & Helper Functions
// ---------------------------

:root {
  --screen-width:     320px;
  --screen-height:    560px;
  --header-bg-color:  #673AB7;
  --splash-bg-color:  #368887;
}

// calculate a circle's circumference based on radius
@function circumference($r){
  $pi: 3.141592653;
  @return 2*$pi*$r;
}


// ---------------------------
// Main Navigation Menu
// ---------------------------

.nav {
  
  // Toggle Button
  &__toggle {
    display:inline-block;
    position:absolute;
    z-index:10;
    padding:0;
    border:0;
    background:transparent;
    outline:0;
    right:15px;
    top:15px;
    cursor:pointer;
    border-radius:50%;
    transition:background-color .15s linear;
    
    &:hover,
    &:focus {
      background-color:rgba(0,0,0,.5);
    }
  }
  
  &__menu {
    display:flex;
    flex-direction:column;
    justify-content:center;
    height:var(--screen-height);
    position:relative;
    z-index:5;
    visibility:hidden;
  }
  
  &__item {
    opacity:0;
    transition: all .3s cubic-bezier(0.000, 0.995, 0.990, 1.000) .3s;
  }
  @for $i from 1 through 5 {
    &__item:nth-child(#{$i}){
      transform:translateY(-40px * $i);
    }
  }
  
  &__link {
    color:white;
    display:block;
    text-align:center;
    text-transform:uppercase;
    letter-spacing:5px;
    font-size:1.25rem;
    text-decoration:none;
    padding:1rem;
    
    &:hover,
    &:focus {
      outline:0;
      background-color:rgba(0,0,0,0.2);
    }
  }
}


// ---------------------------
// SVG Menu Icon
// ---------------------------

.menuicon {
  display:block;
  cursor:pointer;
  color: white;
  
  transform:rotate(0deg);
  transition: .3s cubic-bezier(0.165, 0.840, 0.440, 1.000); 
  
  &__bar,
  &__circle {
    fill:none;
    stroke: currentColor;
    stroke-width:3;
    stroke-linecap:round;
  }
  &__bar {
    transform: rotate(0deg);
    transform-origin:50% 50%;
    transition: transform .25s ease-in-out;
  }
  &__circle {
    transition: stroke-dashoffset .3s linear .1s;
    stroke-dashoffset:circumference(23); // 23 is the <circle>'s radius
    stroke-dasharray:circumference(23);
  }
}


// ---------------------------
// Circular Splash Background
// ---------------------------

.splash {
  position:absolute;
  top:40px;
  right:40px;
  width: 1px;
  height: 1px;
  
  &::after {
    content:"";
    display:block;
    position:absolute;
    border-radius:50%;
    background-color:var(--splash-bg-color);
    
    // screen diameter can be 142vmax at most,
    // circle needs to be twice that size to cover it
    width:284vmax;
    height:284vmax;
    top:-142vmax;
    left:-142vmax;
    
    transform: scale(0);
    transform-origin:50% 50%;
    transition: transform .5s cubic-bezier(0.755, 0.050, 0.855, 0.060);
    
    // will-change tells the browser we plan to 
    // animate this property in the near future
    will-change:transform;
  }
}


// ---------------------------
// Active State
// ---------------------------

.nav:target,
.nav--open {
  
  //scale the background circle to full size
  > .splash::after {
    transform:scale(1);
  }
  
  //animate the menu icon
  .menuicon {
    color:white;
    transform:rotate(180deg);
    
    &__circle {
      stroke-dashoffset:0;
    }
    &__bar:nth-child(1),
    &__bar:nth-child(4) {
      opacity:0;
    }
    &__bar:nth-child(2) {
      transform: rotate(45deg);
    }
    &__bar:nth-child(3) {
      transform: rotate(-45deg);
    }
  }
  
  //show the nav items
  .nav {
    &__menu {
      visibility:visible;
    }
  
    &__item {
      opacity:1;
      transform:translateY(0);
    }
  }
}

// ---------------------------
// Demo Stuff, Ignore
// ---------------------------

body {
  background-color:#D7D7D7;
  font-family: 'Roboto';
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
}

.viewport {
  width:var(--screen-width);
  height:var(--screen-height);
  margin:0 auto;
  position:relative;
  overflow:hidden;
  background-color:white;
}

.header {
  height:5rem;
  background-color:var(--header-bg-color);
}

.main {
  padding:20px;
}

.gallery {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(130px, 1fr));
  grid-auto-rows: 130px;
  grid-gap:20px;
  
  &__item {
    height:100%;
    background-color:#D8D8D8;
    
    &:hover,
    &:focus {
      background-color:#A4A4A4;
    }
  }
}
            
          
!
            
              const nav = document.querySelector('#nav');
const menu = document.querySelector('#menu');
const menuToggle = document.querySelector('.nav__toggle');
let isMenuOpen = false;


// TOGGLE MENU ACTIVE STATE
menuToggle.addEventListener('click', e => {
  e.preventDefault();
  isMenuOpen = !isMenuOpen;
  
  // toggle a11y attributes and active class
  menuToggle.setAttribute('aria-expanded', String(isMenuOpen));
  menu.hidden = !isMenuOpen;
  nav.classList.toggle('nav--open');
});


// TRAP TAB INSIDE NAV WHEN OPEN
nav.addEventListener('keydown', e => {
  // abort if menu isn't open or modifier keys are pressed
  if (!isMenuOpen || e.ctrlKey || e.metaKey || e.altKey) {
    return;
  }
  
  // listen for tab press and move focus
  // if we're on either end of the navigation
  const menuLinks = menu.querySelectorAll('.nav__link');
  if (e.keyCode === 9) {
    if (e.shiftKey) {
      if (document.activeElement === menuLinks[0]) {
        menuToggle.focus();
        e.preventDefault();
      }
    } else if (document.activeElement === menuToggle) {
      menuLinks[0].focus();
      e.preventDefault();
    }
  }
});

            
          
!
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