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CSS

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HTML 

              
                <div class='page'>
  <header class='header'>
    <div class='menu-btn-container'>
      <span class='menu-btn'>Menu</span>
    </div>
    <nav class='main-menu'>
      <ul class='menu'>
        <li><a href='#'>Home</a></li>
        <li><a href='#'>Team</a></li>
        <li><a href='#'>Services</a></li>
        <li><a href='#'>About</a></li>
        <li><a href='#'>Contact</a></li>
      </ul>
      <span class='menu-close-btn'>×</span>
    </nav>
    <div class='overlay'></div>
  </header>
  <div class='main'>
    <div class='main-content'>
      <h1>Pullout Menu with Overlay</h1>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent congue ex id purus lobortis placerat. Etiam sed convallis ipsum. Cras mattis turpis nunc, non tempus leo rutrum vel. Ut quis pulvinar justo. Praesent ut suscipit odio. Nunc sodales, arcu vitae sagittis imperdiet, odio tellus volutpat urna, eu finibus mauris elit ac sem. Nam mattis dui quis mi porttitor sagittis. Cras a rhoncus erat. Phasellus quis ultricies justo. Nam ut ante et lectus pharetra venenatis. Praesent ullamcorper pretium facilisis.</p>
      <p>Nunc et tellus tempus, cursus elit non, porttitor nibh. Nam imperdiet neque et pharetra laoreet. Praesent gravida libero sed libero malesuada porta. Duis a ipsum nec neque faucibus aliquet et id lectus. Phasellus vel condimentum magna. Nullam non metus justo. Cras vel arcu lectus. Suspendisse porttitor ipsum in enim interdum, in lacinia elit viverra. Phasellus vel neque tincidunt dui gravida ullamcorper at id erat. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Quisque nec erat et urna viverra mollis. Curabitur aliquet velit quis massa porta ultrices.</p>
      <p>Suspendisse orci est, tincidunt in leo ac, pellentesque laoreet sapien. Integer vehicula massa vel interdum posuere. Etiam mauris arcu, commodo non molestie id, porttitor ac risus. Aenean ac sem sit amet ligula egestas sollicitudin. Praesent id tristique velit. Phasellus sed nulla ac neque iaculis scelerisque. Donec elit lorem, efficitur suscipit neque vel, dictum luctus erat. In hendrerit accumsan est id ullamcorper. Fusce neque felis, faucibus et felis a, cursus cursus augue.</p>
    </div>
  </div>
</div>
!

CSS 

              
                /* Typography */
$fontFamily: Helvetica, Arial, sans-serif;
$rootFontSize: 16px;
$fontSize: 0.875rem;
$headerFontSize: 1.5rem;


/* Color */
$backgroundColor: #ffffff;
$menuBackgroundColor: rgba(#ffffff, 0.9);
$fontColor: #000000;
$linkFontColor: #5f5f5f;
$overlayColor: #000000;


/* Base Styles */
html {
  font-size: $rootFontSize;
}

body {
  font-family: $fontFamily;
  font-size: $fontSize;
  color: $fontColor;
  background: $backgroundColor;
}

ul {
  padding: 0;
  margin: 0;
}

li {
  list-style: none !important;
}


/* Header Styles */
.menu-btn {
  cursor: pointer;
  transition: 0.2s;
  &:hover {
    color: $linkFontColor;
  }
}


/* Navigation Styles */
.main-menu {
  position: fixed;
  top: 0;
  right: 100vw;
  width: auto;
  height: 100vh;
  background: $menuBackgroundColor;
  z-index: 20;
  overflow: auto;
}

.menu {
  padding: 1rem 5rem 0 1rem;
  white-space: nowrap;

  li {
    padding-bottom: 1rem;
  }

  a {
    display: block;
    text-decoration: none;
    transition: 0.2s;

    &:link, &:visited {
      color: $fontColor;
    }
    &:hover, &:active, &:focus {
      text-decoration: none;
      color: $linkFontColor;
    }
  }
}

.menu-close-btn {
  position: absolute;
  top: 0;
  right: 0;
  margin: 0.875rem 1rem 0 0;
  cursor: pointer;
  transition: 0.2s;
  &:hover {
    color: $linkFontColor;
  }
}


/* Overlay Styles */
.overlay {
  display: none;
  position: fixed;
  top: -20vh;
  left: -20vw;
  background: $overlayColor;
  opacity: 0;
  width: 140vw;
  height: 140vh;
  z-index: 10;
}


/* Page Styles */
h1 {
  font-size: $headerFontSize;
  text-align: center;
  font-weight: normal;
}
!

JS 

              
                jQuery(document).ready(function($) {
  
  /* Variable declaration */
  var mainMenu = $('.main-menu'),
      menuBtn = $('.menu-btn'),
      menuCloseBtn = $('.menu-close-btn'),
      overlay = $('.overlay'),
      windowVar = $(window),
      slidePos,
      slideTime = 400;
  
  /* Functions for opening and closing menu */
  function calcSlidePos(object) {
    var objectWidth = object.outerWidth();
    slidePos = (windowVar.width() - objectWidth) + "px";
  }
  
  function openMenu(menu) {
    menu.animate({right: slidePos}, slideTime)
    .removeClass("open close").addClass("open");
  }
  
  function closeMenu(menu) {
    menu.animate({right: "100vw"}, slideTime)
    .removeClass("open close").addClass("close");
  }
  
  /* Functions for overlay */
  function overlayFadeIn(overlay) {
    overlay.css({display: "block"}).animate({opacity: 0.85}, slideTime);
  }
  
  function overlayFadeOut(overlay) {
    overlay.animate({opacity: 0}, slideTime, function() {
      $(this).css({display: "none"});
    });
  }
  
  /* Page JS */
  menuBtn.click(function() {
    calcSlidePos(mainMenu);
    openMenu(mainMenu);
    overlayFadeIn(overlay);
  });
  
  menuCloseBtn.click(function() {
    closeMenu(mainMenu);
    overlayFadeOut(overlay);
  });
  
  overlay.click(function() {
    closeMenu(mainMenu);
    overlayFadeOut(overlay);
  });
  
});
!
999px

Console