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HTML

              
                	<header>
		<div id="cd-logo"><a href="#0"><img src="https://unsplash.it/50" alt="Logo"></a></div>
		<h1>Smart Fixed Navigation</h1>
	</header>

	<div id="cd-nav">
		<a href="#0" class="cd-nav-trigger">Menu<span></span></a>

		<nav id="cd-main-nav">
			<ul>
				<li><a href="#0">Homepage</a></li>
				<li><a href="#0">Services</a></li>
				<li><a href="#0">Portfolio</a></li>
				<li><a href="#0">Pricing</a></li>
				<li><a href="#0">Contact</a></li>
			</ul>
		</nav>
	</div>

	<main>
		<ul id="cd-gallery-items" class="cd-container">
			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>

			<li>
				<img src="https://unsplash.it/200" alt="Preview image">
			</li>
		</ul> <!-- cd-gallery-items -->
	</main>

              
            
!

CSS

              
                /* -------------------------------- 

Primary style

-------------------------------- */
html * {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

*, *:after, *:before {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  font-size: 100%;
  font-family: "Source Sans Pro", sans-serif;
  color: #2c3e51;
  background-color: #2c3e51;
}

a {
  color: #e84a64;
  text-decoration: none;
}

img {
  max-width: 100%;
}

/* -------------------------------- 

Modules - reusable parts of our design

-------------------------------- */
.cd-container {
  /* this class is used to give a max-width to the element it is applied to, and center it horizontally when it reaches that max-width */
  width: 90%;
  max-width: 1170px;
  margin: 0 auto;
}
.cd-container::after {
  /* clearfix */
  content: '';
  display: table;
  clear: both;
}

/* -------------------------------- 

Main components 

-------------------------------- */
header {
  position: relative;
  height: 200px;
  background: white;
  text-align: center;
  margin-bottom: 1em;
  padding-top: 3em;
}
header #cd-logo {
  margin-bottom: 3em;
}
header h1 {
  font-size: 20px;
  font-size: 1.25rem;
}
@media only screen and (min-width: 768px) {
  header {
    margin-bottom: 4em;
  }
}
@media only screen and (min-width: 1170px) {
  header {
    height: 400px;
    padding-top: 11em;
  }
  header #cd-logo {
    position: absolute;
    top: 40px;
    left: 5%;
  }
  header h1 {
    font-size: 40px;
    font-size: 2.5rem;
    font-weight: 300;
  }
}

#cd-nav ul {
  /* mobile first */
  position: fixed;
  width: 90%;
  max-width: 400px;
  right: 5%;
  bottom: 20px;
  border-radius: 0.25em;
  box-shadow: 0 0 10px rgba(232, 74, 100, 0.4);
  background: white;
  visibility: hidden;
  /* remove overflow:hidden if you want to create a drop-down menu - but then remember to fix/eliminate the list items animation */
  overflow: hidden;
  z-index: 1;
  /* Force Hardware Acceleration in WebKit */
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: scale(0);
  -moz-transform: scale(0);
  -ms-transform: scale(0);
  -o-transform: scale(0);
  transform: scale(0);
  -webkit-transform-origin: 100% 100%;
  -moz-transform-origin: 100% 100%;
  -ms-transform-origin: 100% 100%;
  -o-transform-origin: 100% 100%;
  transform-origin: 100% 100%;
  -webkit-transition: -webkit-transform 0.3s, visibility 0s 0.3s;
  -moz-transition: -moz-transform 0.3s, visibility 0s 0.3s;
  transition: transform 0.3s, visibility 0s 0.3s;
}
#cd-nav ul li {
  /* Force Hardware Acceleration in WebKit */
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
#cd-nav ul.is-visible {
  visibility: visible;
  -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  -o-transform: scale(1);
  transform: scale(1);
  -webkit-transition: -webkit-transform 0.3s, visibility 0s 0s;
  -moz-transition: -moz-transform 0.3s, visibility 0s 0s;
  transition: transform 0.3s, visibility 0s 0s;
}
#cd-nav ul.is-visible li:nth-child(1) {
  /* list items animation */
  -webkit-animation: cd-slide-in 0.2s;
  -moz-animation: cd-slide-in 0.2s;
  animation: cd-slide-in 0.2s;
}
#cd-nav ul.is-visible li:nth-child(2) {
  -webkit-animation: cd-slide-in 0.3s;
  -moz-animation: cd-slide-in 0.3s;
  animation: cd-slide-in 0.3s;
}
#cd-nav ul.is-visible li:nth-child(3) {
  -webkit-animation: cd-slide-in 0.4s;
  -moz-animation: cd-slide-in 0.4s;
  animation: cd-slide-in 0.4s;
}
#cd-nav ul.is-visible li:nth-child(4) {
  -webkit-animation: cd-slide-in 0.5s;
  -moz-animation: cd-slide-in 0.5s;
  animation: cd-slide-in 0.5s;
}
#cd-nav ul.is-visible li:nth-child(5) {
  -webkit-animation: cd-slide-in 0.6s;
  -moz-animation: cd-slide-in 0.6s;
  animation: cd-slide-in 0.6s;
}
#cd-nav li a {
  display: block;
  padding: 1.6em;
  border-bottom: 1px solid #eff2f6;
}
#cd-nav li:last-child a {
  border-bottom: none;
}
@media only screen and (min-width: 1170px) {
  #cd-nav ul {
    /* the navigation moves to the top */
    position: absolute;
    width: auto;
    max-width: none;
    bottom: auto;
    top: 36px;
    background: transparent;
    visibility: visible;
    box-shadow: none;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
    -webkit-transition: all 0s;
    -moz-transition: all 0s;
    transition: all 0s;
  }
  #cd-nav li {
    display: inline-block;
  }
  #cd-nav li a {
    opacity: 1;
    padding: .4em;
    margin-left: 1.6em;
    border-bottom: none;
  }
  #cd-nav li a:hover {
    color: #00bd9b;
  }
  #cd-nav.is-fixed ul {
    /* when the user scrolls down, the navigation moves to the bottom right in Fixed position - as on touch devices */
    position: fixed;
    width: 90%;
    max-width: 400px;
    bottom: 20px;
    top: auto;
    background: white;
    visibility: hidden;
    box-shadow: 0 0 10px rgba(232, 74, 100, 0.4);
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform: scale(0);
  }
  #cd-nav.is-fixed ul li {
    display: block;
  }
  #cd-nav.is-fixed ul li a {
    padding: 1.6em;
    margin-left: 0;
    border-bottom: 1px solid #eff2f6;
  }
  #cd-nav ul.has-transitions {
    /* this class is used to bring back transitions when the navigation moves at the bottom right */
    -webkit-transition: -webkit-transform 0.3s, visibility 0s 0.3s;
    -moz-transition: -moz-transform 0.3s, visibility 0s 0.3s;
    transition: transform 0.3s, visibility 0s 0.3s;
  }
  #cd-nav ul.is-visible {
    /* this class is used to bring back the navigation animation - as on touch devices */
    visibility: visible;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
    -webkit-transition: -webkit-transform 0.3s, visibility 0s 0s;
    -moz-transition: -moz-transform 0.3s, visibility 0s 0s;
    transition: transform 0.3s, visibility 0s 0s;
  }
  #cd-nav ul.is-hidden {
    /* this class is used to animate the scale down the navigation when the user scrolls down with the navigation still open */
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform: scale(0);
    -webkit-transition: -webkit-transform 0.3s;
    -moz-transition: -moz-transform 0.3s;
    transition: transform 0.3s;
  }
}

.cd-nav-trigger {
  position: fixed;
  bottom: 20px;
  right: 5%;
  width: 44px;
  height: 44px;
  background: white;
  border-radius: 0.25em;
  box-shadow: 0 0 10px rgba(232, 74, 100, 0.4);
  /* image replacement */
  overflow: hidden;
  text-indent: 100%;
  white-space: nowrap;
  z-index: 2;
}
.cd-nav-trigger span {
  /* the span element is used to create the menu icon */
  position: absolute;
  display: block;
  width: 20px;
  height: 2px;
  background: #e84a64;
  top: 50%;
  margin-top: -1px;
  left: 50%;
  margin-left: -10px;
  -webkit-transition: background 0.3s;
  -moz-transition: background 0.3s;
  transition: background 0.3s;
}
.cd-nav-trigger span::before, .cd-nav-trigger span::after {
  content: '';
  position: absolute;
  left: 0;
  background: inherit;
  width: 100%;
  height: 100%;
  /* Force Hardware Acceleration in WebKit */
  -webkit-transform: translateZ(0);
  -moz-transform: translateZ(0);
  -ms-transform: translateZ(0);
  -o-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transition: -webkit-transform 0.3s, background 0s;
  -moz-transition: -moz-transform 0.3s, background 0s;
  transition: transform 0.3s, background 0s;
}
.cd-nav-trigger span::before {
  top: -6px;
  -webkit-transform: rotate(0);
  -moz-transform: rotate(0);
  -ms-transform: rotate(0);
  -o-transform: rotate(0);
  transform: rotate(0);
}
.cd-nav-trigger span::after {
  bottom: -6px;
  -webkit-transform: rotate(0);
  -moz-transform: rotate(0);
  -ms-transform: rotate(0);
  -o-transform: rotate(0);
  transform: rotate(0);
}
.cd-nav-trigger.menu-is-open {
  box-shadow: none;
}
.cd-nav-trigger.menu-is-open span {
  background: rgba(232, 74, 100, 0);
}
.cd-nav-trigger.menu-is-open span::before, .cd-nav-trigger.menu-is-open span::after {
  background: #e84a64;
}
.cd-nav-trigger.menu-is-open span::before {
  top: 0;
  -webkit-transform: rotate(135deg);
  -moz-transform: rotate(135deg);
  -ms-transform: rotate(135deg);
  -o-transform: rotate(135deg);
  transform: rotate(135deg);
}
.cd-nav-trigger.menu-is-open span::after {
  bottom: 0;
  -webkit-transform: rotate(225deg);
  -moz-transform: rotate(225deg);
  -ms-transform: rotate(225deg);
  -o-transform: rotate(225deg);
  transform: rotate(225deg);
}
@media only screen and (min-width: 1170px) {
  .cd-nav-trigger {
    /* the the menu triger is hidden by default on desktop devices */
    visibility: hidden;
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform: scale(0);
    -webkit-transition: -webkit-transform 0.3s, visibility 0s 0.3s;
    -moz-transition: -moz-transform 0.3s, visibility 0s 0.3s;
    transition: transform 0.3s, visibility 0s 0.3s;
  }
  .is-fixed .cd-nav-trigger {
    visibility: visible;
    -webkit-transition: all 0s;
    -moz-transition: all 0s;
    transition: all 0s;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
    -webkit-animation: cd-bounce-in 0.3s linear;
    -moz-animation: cd-bounce-in 0.3s linear;
    animation: cd-bounce-in 0.3s linear;
  }
}

#cd-gallery-items li {
  margin-bottom: 1.5em;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  border-radius: 0.25em;
}
#cd-gallery-items li img {
  width: 100%;
  display: block;
  border-radius: 0.25em;
}
@media only screen and (min-width: 768px) {
  #cd-gallery-items li {
    width: 48%;
    float: left;
    margin-bottom: 2em;
    margin-right: 4%;
  }
  #cd-gallery-items li:nth-child(2n) {
    margin-right: 0;
  }
}
@media only screen and (min-width: 1170px) {
  #cd-gallery-items li {
    width: 31%;
    float: left;
    margin-bottom: 2.5em;
    margin-right: 3.5%;
  }
  #cd-gallery-items li:nth-child(2n) {
    margin-right: 3.5%;
  }
  #cd-gallery-items li:nth-child(3n) {
    margin-right: 0;
  }
}

@-webkit-keyframes cd-slide-in {
  0% {
    -webkit-transform: translateX(100px);
  }

  100% {
    -webkit-transform: translateY(0);
  }
}
@-moz-keyframes cd-slide-in {
  0% {
    -moz-transform: translateX(100px);
  }

  100% {
    -moz-transform: translateY(0);
  }
}
@keyframes cd-slide-in {
  0% {
    -webkit-transform: translateX(100px);
    -moz-transform: translateX(100px);
    -ms-transform: translateX(100px);
    -o-transform: translateX(100px);
    transform: translateX(100px);
  }

  100% {
    -webkit-transform: translateY(0);
    -moz-transform: translateY(0);
    -ms-transform: translateY(0);
    -o-transform: translateY(0);
    transform: translateY(0);
  }
}
@-webkit-keyframes cd-bounce-in {
  0% {
    -webkit-transform: scale(0);
  }

  60% {
    -webkit-transform: scale(1.2);
  }

  100% {
    -webkit-transform: scale(1);
  }
}
@-moz-keyframes cd-bounce-in {
  0% {
    -moz-transform: scale(0);
  }

  60% {
    -moz-transform: scale(1.2);
  }

  100% {
    -moz-transform: scale(1);
  }
}
@keyframes cd-bounce-in {
  0% {
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    -ms-transform: scale(0);
    -o-transform: scale(0);
    transform: scale(0);
  }

  60% {
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    -ms-transform: scale(1.2);
    -o-transform: scale(1.2);
    transform: scale(1.2);
  }

  100% {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    -ms-transform: scale(1);
    -o-transform: scale(1);
    transform: scale(1);
  }
}

              
            
!

JS

              
                jQuery(document).ready(function($){
	// browser window scroll (in pixels) after which the "menu" link is shown
	var offset = 300;

	var navigationContainer = $('#cd-nav'),
		mainNavigation = navigationContainer.find('#cd-main-nav ul');

	//hide or show the "menu" link
	checkMenu();
	$(window).scroll(function(){
		checkMenu();
	});

	//open or close the menu clicking on the bottom "menu" link
	$('.cd-nav-trigger').on('click', function(){
		$(this).toggleClass('menu-is-open');
		//we need to remove the transitionEnd event handler (we add it when scolling up with the menu open)
		mainNavigation.off('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend').toggleClass('is-visible');

	});

	function checkMenu() {
		if( $(window).scrollTop() > offset && !navigationContainer.hasClass('is-fixed')) {
			navigationContainer.addClass('is-fixed').find('.cd-nav-trigger').one('webkitAnimationEnd oanimationend msAnimationEnd animationend', function(){
				mainNavigation.addClass('has-transitions');
			});
		} else if ($(window).scrollTop() <= offset) {
			//check if the menu is open when scrolling up
			if( mainNavigation.hasClass('is-visible')  && !$('html').hasClass('no-csstransitions') ) {
				//close the menu with animation
				mainNavigation.addClass('is-hidden').one('webkitTransitionEnd otransitionend oTransitionEnd msTransitionEnd transitionend', function(){
					//wait for the menu to be closed and do the rest
					mainNavigation.removeClass('is-visible is-hidden has-transitions');
					navigationContainer.removeClass('is-fixed');
					$('.cd-nav-trigger').removeClass('menu-is-open');
				});
			//check if the menu is open when scrolling up - fallback if transitions are not supported
			} else if( mainNavigation.hasClass('is-visible')  && $('html').hasClass('no-csstransitions') ) {
					mainNavigation.removeClass('is-visible has-transitions');
					navigationContainer.removeClass('is-fixed');
					$('.cd-nav-trigger').removeClass('menu-is-open');
			//scrolling up with menu closed
			} else {
				navigationContainer.removeClass('is-fixed');
				mainNavigation.removeClass('has-transitions');
			}
		} 
	}
});
              
            
!
999px

Console