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HTML 

              
                html
 body
    input#navToggle(type='checkbox')
    header
     label.navToggle(for='navToggle', tabindex='0', onclick='onclick') ☰
     nav(role="navmenu")
      ul
       li
        a ᳀
       li.multi
         input#navToggleMulti1(type='checkbox')
         label(for='navToggleMulti1', onclick='onclick') ∮
         ul.dropdown
          li
           a 1
          li
           a 2
          li
           a 3
          li
           a 4
          li
           a 5
          li
           a 6
       li.multi
         input#navToggleMulti2(type='checkbox')
         label(for='navToggleMulti2' onclick='onclick') ⏲
         ul.dropdown
          li
           a 1
          li
           a 2
          li
           a 3
          li
           a 4
          li
           a 5
          li
           a 6
       li
        a ⛺
       li
        a ⭓
       li
        a ⵘ
!

CSS 

              
                //settings
$navmenu-width: 7em;
$navmenu-height: 5em;
$navmenu-color: #1e1e1e;
$navmenu-hover-color: firebrick;
$navmenu-drop-color: firebrick;
$navmenu-drop-hover-color: firebrick;
$navmenu-drop-text-color: whitesmoke;
$navmenu-text-color: whitesmoke;
// https://meyerweb.com/eric/tools/css/reset/
// v2.0 | 20110126
// License: none (public domain)
@mixin meyer-reset {
  html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
  }

  // HTML5 display-role reset for older browsers
  article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {
    display: block;
  }
  body {
    line-height: 1;
  }
  ol, ul {
    list-style: none;
  }
  blockquote, q {
    quotes: none;
  }
  blockquote {
    &:before, &:after {
      content: "";
      content: none;
    }
  }
  q {
    &:before, &:after {
      content: "";
      content: none;
    }
  }
  table {
    border-collapse: collapse;
    border-spacing: 0;
  }
}

@include meyer-reset;

$break-small: 320px;
$break-medium: 740px;
$break-large: 1220px;
//http://timpietrusky.com/advanced-checkbox-hack
body { -webkit-animation: bugfix infinite 1s; }
@-webkit-keyframes bugfix { from {padding:0;} to {padding:0;} }
//http://codeboxers.com/sass-mixin-for-transitions/
@mixin transition($transition-property, $transition-time, $method) {
    -webkit-transition: $transition-property $transition-time $method;
    -moz-transition: $transition-property $transition-time $method;
    -ms-transition: $transition-property $transition-time $method;
    -o-transition: $transition-property $transition-time $method;
    transition: $transition-property $transition-time $method;
}
//http://thesassway.com/intermediate/responsive-web-design-in-sass-using-media-queries-in-sass-32
@mixin respond-to($media) {
  @if $media == handhelds {
    @media only screen and (max-width: $break-small) { @content; }
  }
  @else if $media == small-screens {
    @media only screen and (min-width: $break-small + 1) and (max-width: $break-medium - 1) { @content; }
  }
  @else if $media == medium-screens {
    @media only screen and (min-width: $break-medium + 1) and (max-width: $break-large - 1) { @content; }
  }
  @else if $media == wide-screens {
    @media only screen and (min-width: $break-large) { @content; }
  }
}
body {
  overflow: hidden;
  background: $navmenu-color;
}

//Hide checkboxes
#navToggle, nav[role="navmenu"] ul li.multi input {
  display: none;
}

header label.navToggle {
  line-height: $navmenu-height;
  text-align: center;
  z-index: 10;
  cursor: pointer;
  display: inline-block;
  background: $navmenu-hover-color;
  color: $navmenu-color;
  @include transition(all, 0.2s, ease-in-out);
  @include respond-to(handhelds) { width: 100%; }
  @include respond-to(small-screens) { width: 100%; }
  @include respond-to(medium-screens) { width: $navmenu-width; }
  @include respond-to(wide-screens) { width: $navmenu-width; }
  &:hover {
    background: $navmenu-text-color;
    color: $navmenu-color;
  }
}

#navToggle:checked ~ header nav[role="navmenu"] {
  @include respond-to(handhelds) { left: -100%;}
  @include respond-to(small-screens) { left: -100%;}
  @include respond-to(medium-screens) { left: -$navmenu-width; }
  @include respond-to(wide-screens) { left: -$navmenu-width;}
}

nav[role="navmenu"] ul li.multi input:checked ~ .dropdown li {
    max-height: 100%;
}
nav[role="navmenu"] ul li.multi input:checked ~ .dropdown {
    width: 100%;
    pointer-events: auto;
}
nav[role="navmenu"] ul li.multi input:checked ~ label {
    background: $navmenu-hover-color;
    font-weight: 700;
}
nav[role="navmenu"] ul li.multi input:checked ~ label:after {
    transform: rotateZ(0deg);
}

nav[role="navmenu"] {
  position: absolute;
  left: 0;
  overflow-y: scroll;
  overflow-x: hidden;
  max-height: 100%;
  @include transition(all, 0.2s, ease-in-out);
  @include respond-to(handhelds) { width: 100%;top: $navmenu-height;}
  @include respond-to(small-screens) { width: 100%; top: $navmenu-height;}
  @include respond-to(medium-screens) { width: $navmenu-width; }
  @include respond-to(wide-screens) { width: $navmenu-width;}
}

nav[role="navmenu"] ul li a,  nav[role="navmenu"] .dropdown li a, nav[role="navmenu"] ul li label {
  background: $navmenu-color;
  color: $navmenu-text-color;
  @include transition(all, 0.2s, ease-in-out);
  @include respond-to(handhelds) { width: 100%;}
  @include respond-to(small-screens) { width: 100%;}
  @include respond-to(medium-screens) { width: $navmenu-width; }
  @include respond-to(wide-screens) { width: $navmenu-width; }
}
nav[role="navmenu"] .dropdown li a {
 background: $navmenu-drop-color;
 color: $navmenu-drop-text-color;
}
nav[role="navmenu"] ul li, nav[role="navmenu"] ul li a, , nav[role="navmenu"] ul li label {
  text-align: center;
}
nav[role="navmenu"] .dropdown li a {
  height: $navmenu-height;
  cursor: pointer;
  font-weight: 400;
}
nav[role="navmenu"] ul li a, nav[role="navmenu"] ul li label {
  outline: none;
  display: inline-block;
  position: relative;
  text-decoration: none;
  cursor: pointer;
  line-height: $navmenu-height;
  &:hover {
    background: $navmenu-hover-color;
    font-weight: 700;
  }
}
nav[role="navmenu"] ul li label {
  &:hover {
    background: $navmenu-drop-hover-color;
    font-weight: 700;
  }  
}
nav[role="navmenu"] ul li.multi label {
  &:after {
    @include transition(all, 0.2s, ease-in-out);
    position: absolute;
    transform: rotateZ(-90deg);
    top: 0;
    right: 1em;
    content: '▼';
  }
}
nav[role="navmenu"] ul li .dropdown {
  width: 0;
  position: relative;
  pointer-events: none;
  @include transition(width, 0.2s, linear);
}
nav[role="navmenu"] ul li .dropdown li {
  max-height: 0;
  overflow: hidden;
  @include transition(max-height, 0.35s, cubic-bezier(0.175, 0.885, 0.32, 1.275));
  z-index: 10;
}
//https://gist.github.com/jslegers/6088809
/**
 * Mixin scrollbar
 */
@mixin scrollbar($size, $primary, $secondary: lighten($primary, 25%)) {
	::-webkit-scrollbar {
		width:  $size;
		height: $size;
	}
 
	::-webkit-scrollbar-thumb {
		background: $primary;
	}
 
	::-webkit-scrollbar-track {
		background: $secondary;
	}
  
  // For Internet Explorer
  body {
    scrollbar-face-color: $primary;
    scrollbar-track-color: $secondary;
  }
}
@include scrollbar(.5em, $navmenu-hover-color);
!

JS
!
999px

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