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HTML

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Adding Classes

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CSS

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CSS Base

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Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                input#navToggle(type="checkbox")
.wrapper
  nav.navContent
    .navToggle
      label.navToggleBtn(for="navToggle")
        span.bar.barTop
        span.bar.middle
        span.bar.barBottom
      
    .navigation
      ul
        li
          a(href="#") NAVIGATION 01
        li
          a(href="#") NAVIGATION 02
        li
          a(href="#") NAVIGATION 03
        li
          a(href="#") NAVIGATION 04
        li
          a(href="#") NAVIGATION 05
        li
          a(href="#") NAVIGATION 06
        li
          a(href="#") NAVIGATION 07
  main#main
    .content
      p Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. In enim justo, rhoncus ut, imperdiet a, venenatis vitae, justo. Nullam dictum felis eu pede mollis pretium.
      p Integer tincidunt. Cras dapibus. Vivamus elementum semper nisi. Aenean vulputate eleifend tellus. Aenean leo ligula, porttitor eu, consequat vitae, eleifend ac, enim. Aliquam lorem ante, dapibus in, viverra quis, feugiat a, tellus. Phasellus viverra nulla ut metus varius laoreet. Quisque rutrum. Aenean imperdiet. Etiam ultricies nisi vel augue. Curabitur ullamcorper ultricies nisi. Nam eget dui. Etiam rhoncus.
      p Maecenas tempus, tellus eget condimentum rhoncus, sem quam semper libero, sit amet adipiscing sem neque sed ipsum. Nam quam nunc, blandit vel, luctus pulvinar, hendrerit id, lorem. Maecenas nec odio et ante tincidunt tempus. Donec vitae sapien ut libero venenatis faucibus. Nullam quis ante. Etiam sit amet orci eget eros faucibus tincidunt. Duis leo. Sed fringilla mauris sit amet nibh. Donec sodales sagittis magna.
      p Sed consequat, leo eget bibendum sodales, augue velit cursus nunc, quis gravida magna mi a libero. Fusce vulputate eleifend sapien. Vestibulum purus quam, scelerisque ut, mollis sed, nonummy id, metus. Nullam accumsan lorem in dui. Cras ultricies mi eu turpis hendrerit fringilla. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; In ac dui quis mi consectetuer lacinia. Nam pretium turpis et arcu. Duis arcu tortor, suscipit eget, imperdiet nec, imperdiet iaculis, ipsum.
      p Sed aliquam ultrices mauris. Integer ante arcu, accumsan a, consectetuer eget, posuere ut, mauris. Praesent adipiscing. Phasellus ullamcorper ipsum rutrum nunc. Nunc nonummy metus. Vestibulum volutpat pretium libero. Cras id dui. Aenean ut eros et nisl sagittis vestibulum. Nullam nulla eros, ultricies sit amet, nonummy id, imperdiet feugiat, pede. Sed lectus. Donec mollis hendrerit risus. Phasellus nec sem in justo pellentesque facilisis. Etiam imperdiet imperdiet orci. Nunc nec neque. Phasellus leo dolor, tempus non, auctor et, hendrerit quis, nisi. Curabitur ligula sapien, tincidunt non, euismod vitae, posuere imperdiet, leo. Maecenas malesuada. Praesent congue erat at massa. Sed cursus turpis vitae tortor. Donec posuere vulputate arcu. Phasellus accumsan cursus velit. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Sed aliquam, nisi quis porttitor congue, elit erat euismod orci, ac
!

CSS 

              
                body
  margin: 0
  padding: 0
  &.fixed
    height: 100%
    width: 100%
    overflow: hidden

 a
   color: #f0810f
   transition: all .25s
   &:hover
     color: #f0810f - 30
  
.wrapper
  background-color: #bcbabe

#main
  margin: 0 auto
  padding: 2.5em 1.5em 3em
  background-color: #fff
  max-width: 48em
  box-sizing: border-box

.navToggle
  position: relative
  margin: 0 auto
  width: 48em
  
.navigation
  text-align: center
  width: 0
  height: 0
  transform: scale(.8)
  transition: transform .25s
  ul
    display: none
    list-style: none
    margin: 0
    padding: 0
  li
    padding: 2em 0
  a
    font-size: 200%
    text-decoration: none
.navToggleBtn
  position: absolute
  top: 0
  left: 0
  display: block
  padding: 8px 0 0
  background-color: #a1d6e2
  border: 0 solid transparent
  border-radius: 0
  width: 40px
  height: 40px
  box-sizing: border-box
  transition: all .3s
  &:hover
    background-color: #a1d6e2 + 20
  .bar
    display: block
    margin: 2px auto
    background: #2a3132
    height: 5px
    width: 30px
    transition: all .3s
  .middle
    opacity: 1
  
#navToggle
  position: absolute

#navToggle:checked + .wrapper    
  .navContent
    position: fixed
    top: 0 // <- need
    bottom: 0 // <- need   
    left: 0
    right: 0
    overflow-y: auto // <- need
    overflow-x: hidden
    width: 100%
    min-height: 100%
  .navigation
    display: block
    background-color: rgba(1, 26, 39, .85)
    width: 100%
    height: auto
    min-height: 100%
    transform: scale(1)
    z-index: 10
    ul
      display: block
      padding-top: 60px
      
  .navToggleBtn
    position: absolute
    top: 10px
    border-width: 3px
    border-color: #f0810f - 50
    border-radius: 50%
    background-color: transparent
    z-index: 11
    &:hover
      border-color: #f0810f
      .bar
        background-color: #f0810f
    .barTop
    .barBottom
      position: absolute
      top: 50%
      left: 0
      right: 0
      margin-top: -2px
      background-color: #f0810f - 50
      height: 3px
      width: 24px
    .barTop
      transform: rotate(45deg)
    .barBottom
      transform: rotate(-45deg)
    .middle
      opacity: 0
!

JS 

              
                $(function(){
  var $body = $('body'),
      $toggele = $('#navToggle');
  $toggele.on('change', function(evt) {
    var v = $toggele.prop('checked'),
        fixed = 'fixed';
    if(v) {
      $body.addClass(fixed);
    } else {
      $body.removeClass(fixed);
    }
    return;
  });
});
!
999px

Console