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CSS

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HTML 

              
                <html>
<head>
  <title>Mobile first navigation menu</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="style.css">
</head>
<body>

  <input type="checkbox" id="show-menu">
  
  <div id="fix-bar">
    <div class="logo">
      <a href="/">logo</a>
    </div>
    
    <div class="push">
      <label class="hamburguer" for="show-menu">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
      </label>
    </div>
  </div>

  <div id="canvas">
    
    <div id="nav">
      <ul class="site-menu">    
        <li><a href="#/work">Work</a></li>
        <li class="has-sub"><a href="#/about">About</a></li>
        <li><a href="#/careers">Careers</a></li>
        <li><a href="#/ideas">Ideas</a></li>
        <li><a href="#/news">News</a></li>
        <li><a href="#/events">Events</a></li>
        <li><a href="#/contact">Contact</a></li>
        <li class="copy">© 2016 Logo. All Rights Reserved.</li>
      </ul>
    </div>

    <label for="show-menu" class="mask"></label>

    <div id="content">
      <h1>Lorem ipsum dolor sit amet</h1>

      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. In ut rerum voluptatum, expedita, ab perspiciatis nulla omnis veritatis, dignissimos explicabo officia neque eos. Itaque, reiciendis corrupti quos. Ipsa, non, itaque!</p>
      <p>Illum minima praesentium reiciendis iure voluptatem, maxime accusamus temporibus, quisquam nihil nostrum placeat, repudiandae facere. Nihil odio quia omnis iure temporibus. Ullam itaque consequatur eveniet voluptatem nam, suscipit nesciunt iste!</p>
      <p>Est eum delectus officia. Sequi hic reiciendis est ullam aliquid rem voluptates deserunt! Accusamus, consequuntur! Delectus distinctio doloremque possimus provident qui rerum id. Molestiae, impedit, porro nisi repellat atque esse.</p>
      <p>At possimus commodi dolorum hic dicta unde ipsam sequi laborum! Dignissimos tempora facere dolore ipsam eligendi repudiandae, ipsa placeat doloribus cumque quod dolores ab, ea labore incidunt ex sapiente! Possimus.</p>
      <p>Maxime beatae quia similique error quod cumque dicta facere, consequuntur quos? Alias ducimus aliquam commodi quis veritatis, beatae libero iure culpa id reiciendis ratione. Dolorum voluptatibus iusto id accusantium adipisci.</p>
      <p>Accusantium molestias velit ut voluptate adipisci sit possimus id. Consequuntur debitis suscipit ducimus nemo officia dolor voluptates saepe doloribus corporis dolorem autem, quasi, tempore maxime sapiente deleniti rem, a. Nesciunt.</p>
      <p>Nemo animi vitae fuga repellendus sequi, laborum voluptates molestias quo reprehenderit tenetur libero non quis deserunt veritatis culpa tempora a, voluptatem itaque. Totam atque id, praesentium corporis eaque dignissimos sed.</p>
      <p>Pariatur omnis expedita voluptates, aut laborum consequatur repudiandae aperiam, delectus voluptate, saepe ea magnam distinctio dolorum a reiciendis suscipit. Corporis ex animi reiciendis vero natus porro, tenetur dignissimos blanditiis quis?</p>
      <p>Adipisci dicta vitae, totam quisquam, aliquam sint non qui hic est beatae architecto laboriosam in. Sed at, pariatur doloremque libero facere voluptates culpa dolore. Quo debitis similique culpa quis fuga?</p>
      <p>Non ipsum porro perferendis pariatur, harum iusto amet dolore quasi aut quidem quod laboriosam libero odit accusamus animi, cumque ea commodi corporis, sequi eaque numquam aliquam! Consequuntur, animi dolorum debitis?</p>
    </div>
  
  </div>

</body>
</html>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Montserrat:700)

$nav-width = 250px
$magenta   = #00a8eb
$timing    = 0.5s
$ease      = ease

* 
  margin 0
  padding 0
  box-sizing border-box

html
body
  height 100%

body
  font-family 'Helvetica Neue', Helvetica, sans-serif

#fix-bar
  position fixed
  top 0
  left 0
  z-index 9
  width 100%
  height 60px
  background-color $magenta
  
  .logo
    position absolute
    left 0
    width $nav-width
    transform translate3d(-50%, 0, 0)
    transition transform $timing $ease
    
    a
      display block
      color #fff
      text-decoration none
      text-transform uppercase
      line-height 24px
      width 60px
      height 24px
      padding 18px 16px 18px 24px
      box-sizing content-box
    
  .push
    position relative
    left 0
    height 100%
    background-color $magenta
    transition transform $timing $ease
    
.hamburguer
  width 72px
  height 60px
  display block
  position relative
  cursor pointer
  
  span
    display block
    position absolute
    height 4px
    width 24px
    background #fff
    opacity 1
    left 24px
    transform rotate(0deg)
    transition .3s ease-in-out
    
    &:nth-child(1)
      top 20px

    &:nth-child(2)
    &:nth-child(3)
      top 28px

    &:nth-child(4)
      top 36px

#canvas
  position relative
  height 100%
  padding-top 60px
  overflow hidden

#nav
  overflow-y scroll
  position absolute
  left 0
  height 100%
  width $nav-width
  transform translate3d(-50%, 0, 0)
  transition transform $timing $ease
  padding-top 12px
  padding-bottom 60px // fix bar
  
  a
    text-decoration none
    color #000
    display block
    padding 14px 24px
    font 20px/1 'Montserrat', sans-serif
    font-weight 700
    
    &:hover
      background-color #eee
  
  .site-menu
    position relative
    min-height 100%
    padding-bottom 60px // copy height

  .copy
    position absolute
    bottom 0
    padding 16px 24px
    font-size 12px
    line-height 1.4

#content
  background-color #fff
  overflow-y scroll
  position relative
  left 0
  height 100%
  transition transform $timing $ease
  transform translate3d(0, 0, 0)
  padding 20px

.mask
  position absolute
  top 60px
  left 0
  z-index -1
  width 100%
  height 100%
  opacity 0
  transition opacity $timing $ease, transform $timing $ease, z-index 0s $timing
  background-color rgba(0, 0, 0, 0.5)

// trigger menu
input#show-menu
  position absolute
  opacity 0

// show mobile nav  
input#show-menu:checked ~ 
  
  #fix-bar
    
    .push
      transform translate3d($nav-width, 0, 0)
      
    .hamburguer span
      &:nth-child(1)
      &:nth-child(4)
        top 28px
        width 0
        left 50%

      &:nth-child(2)
        transform rotate(45deg)

      &:nth-child(3)
        transform rotate(-45deg)
  
  #canvas
    
    .mask
      z-index 1
      opacity 1
      transform translate3d($nav-width, 0, 0)
      transition opacity $timing $ease, transform $timing $ease
      
    #nav
    ^[0] #fix-bar .logo
      transform translate3d(0, 0, 0)

    #content
      transform translate3d($nav-width, 0, 0)
!

JS 

              
                // TODO refact stylus
!
999px

Console