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HTML 

              
                //- mixin for navigation items
mixin nav-item (navLinkText, navLinkIcon)

  //navigation item
  li.nav__item
  
    //navigation link
    a.nav__link(href="#" title= navLinkText)
      i.nav__link-icon.material-icons= navLinkIcon
      = navLinkText


//page block includes a navigation and a content block 
.page

  //navigation
  nav.nav
  
    //close button
    .nav__close
      
    //navigation list
    ul.nav__list
      
      +nav-item('Home', 'home')
      +nav-item('About', 'equalizer')
      +nav-item('Tour', 'business_center')
      +nav-item('Settings', 'settings')
      +nav-item('Plans', 'grade')
      +nav-item('Log In', 'perm_identity')
  
  //content part
  .page__content
  
    //open navigation button
    .nav-open-btn
      .nav-open-btn__bar
      .nav-open-btn__bar
      .nav-open-btn__bar
  
    //content block
    .content
      
      h1 Off-Canvas #[span Navigation] Variations
      
      .submenu
        .submenu__item
         a(href="https://github.com/eisenfox/off-canvas-navigation" title="Check on GitHub" target="_blanc") 
            i(class="material-icons") toc
            | Check on GitHub
        .submenu__item
          a(href="http://100dayscode.co.uk/" title="Check Codepen Challenge" target="_blanc") 
            i(class="material-icons") toc
            | Check Codepen Challenge
            
      h2 Click the button to change the demo
            
      //demo buttons
      .demo-btns
        
        button.demo-btn.js-active(type="button") Demo 1
          
        button.demo-btn(type="button") Demo 2
          
        button.demo-btn(type="button") Demo 3
          
        button.demo-btn(type="button") Demo 4
          
        button.demo-btn(type="button") Demo 5
!

CSS 

              
                //COMMON VARIABLES
$dark-theme-color: #1c1c1c;
$accent-theme-color: #4caf50;
$accent-theme-color1: #00BD9D;
$accent-theme-color2: #832161;
$accent-theme-color3: #FE9000;
$accent-theme-color4: #D72638;
$accent-theme-color5: #FC448D;
$light-theme-color: #fff;

//MIXINS

//transitions mixin
@mixin transition-mix($property: all, $duration: 0.2s, $timing: linear, $delay: 0s) {
  transition-property: $property;
  transition-duration: $duration;
  transition-timing-function: $timing;
  transition-delay: $delay;
}

//position absolute mixin
@mixin position-absolute ($top: null, $left: null, $right: null, $bottom: null) {
  position: absolute;
  top: $top;
  left: $left;
  right: $right;
  bottom: $bottom;
}

/* common styles !!!YOU DON'T NEED THEM  */
body {
  font: {
    family: 'Overpass', sans-serif;
    size: 16px;
  }
  color: $dark-theme-color;
}

.content {
  width: 550px;
  padding-top: 50px;
  margin: auto;
  text-align: center;
}

h1 {
  margin: 0;

  font: {
    weight: 400;
    size: 35px;
  }

  span {
    font: {
      family: 'The Girl Next Door', cursive;
      weight: 700;
    }
    color: $accent-theme-color;
  }
}

.submenu {
  display: flex;
  justify-content: center;
  margin: 10px auto 0;
}

.submenu__item {
  display: flex;
  align-items: center;
  justify-content: center;
  
  &:not(:last-child) {
    margin-right: 30px;
  }

  a {
    @include transition-mix;

    display: inline-flex;
    align-items: center;

    font: {
      size: 17px;
    }
    color: inherit;
    text-decoration: none;

    &:hover {
      color: $accent-theme-color;
    }

    i {
      color: $accent-theme-color;
      margin-right: 5px;
    }
  }
}

h2 {
  margin-top: 40px;  
  
  text-decoration: underline;
}

.demo-btns {
  display: flex;
  justify-content: space-between;
}

.demo-btn {
  @include transition-mix;
  
  padding: 8px 15px;
  
  background-color: transparent;
  outline: none;
  border: 2px solid currentColor;
  border-radius: 5px;
  
  cursor: pointer;
  
  &:nth-child(1) {
    color: $accent-theme-color1;
  }
  
  &:nth-child(2) {
    color: $accent-theme-color2;
  }
  
  &:nth-child(3) {
    color: $accent-theme-color3;
  }
  
  &:nth-child(4) {
    color: $accent-theme-color4;
  }
  
  &:nth-child(5) {
    color: $accent-theme-color5;
  }
  
  &:hover,
  &.js-active {
    color: $light-theme-color;
    
    &:nth-child(1) {
      background-color: $accent-theme-color1;
      border-color: $accent-theme-color1;
    }

    &:nth-child(2) {
      background-color: $accent-theme-color2;
      border-color: $accent-theme-color2;
    }

    &:nth-child(3) {
      background-color: $accent-theme-color3;
      border-color: $accent-theme-color3;
    }

    &:nth-child(4) {
      background-color: $accent-theme-color4;
      border-color: $accent-theme-color4;
    }

    &:nth-child(5) {
      background-color: $accent-theme-color5;
      border-color: $accent-theme-color5;
    }
  }
}

/* page's styles !!!YOU NEED THEM */
html,
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  
  overflow-x: hidden;
}

.page,
.page__content {
  position: relative;
}

.page {
  min-height: 100vh;
  
  perspective: 1500px;
  
  background-color: rgba($dark-theme-color, .5);
}

.page__content {
  min-height: 100vh;
  
  background-color: $light-theme-color;
}

/* navigation styles */
$nav-width: 300px;
$nav-bg: $dark-theme-color;
$nav-padding: 30px;

$nav-list-offset-vert: 45px;

$nav-item-offset-vert: 20px;

$nav-icon-offset-horz: 10px;

.nav {
  position: fixed;
  top: 0;
  bottom: 0;
  
  width: $nav-width;
  padding: $nav-padding;
  box-sizing: border-box;
  
  background-color: $nav-bg;
  box-shadow: 4px 0 5px 0 rgba(0,0,0,0.14), 
              1px 0 10px 0 rgba(0,0,0,0.12), 
              2px 0 4px -1px rgba(0,0,0,0.3);
  
  opacity: 0;
  visibility: hidden;
  
  z-index: 500;
}

/* nav list styles */
.nav__list {
  position: relative;
  
  padding: 0;
  margin: $nav-list-offset-vert 0 0 0;
  
  list-style-type: none;
}

/* nav item styles */
.nav__item {
  
  &:not(:last-child) {
    margin-bottom: $nav-item-offset-vert;
  }
}

/* nav link styles */
.nav__link {
  @include transition-mix;
  
  display: inline-flex;
  align-items: center;
  
  color: $light-theme-color;
  text-decoration: none;
  
  &:hover {
    color: $accent-theme-color;
  }
}

/* nav link icon styles */
.nav__link-icon {
  position: relative;
  top: - 3px; /* !!!use only with material design icons */
  
  margin-right: $nav-icon-offset-horz;
  
  color: currentColor;
}

/* close icon styles */
.nav__close {
  @include position-absolute($top: $nav-padding, $right: $nav-padding);
  
  width: 40px;
  height: 25px;
  
  cursor: pointer;
  
  /* close icon elements */
  &:before,
  &:after {
    @include transition-mix;
    
    display: block;
    width: 4px;
    height: 28px;
    border-radius: 10px;
    
    content: '';
    
    transform-origin: center center;
    background-color: $light-theme-color;
  }
  
  &:before {
    @include position-absolute($top: 0, $left: 18px);
    transform: rotate(-45deg);
  }
  
  &:after {
    @include position-absolute($top: 0, $right: 18px);
    transform: rotate(45deg);
  }
  
  /* hover effect */
  &:hover {
    
    &:before,
    &:after {
      background-color: $accent-theme-color;
    }
  }
}

/* nav open btn styles */
$nav-open-btn-vert-offset: 30px;
$nav-open-btn-horz-offset: 30px;

.nav-open-btn {
  @include position-absolute($top: $nav-open-btn-vert-offset, $left: $nav-open-btn-horz-offset);
 @include transition-mix();
  
  width: 35px;
  height: 25px;
 
  overflow: hidden;
  cursor: pointer;
  
  //used to hide open btn when the nav is opened
  &.js-hidden {
    @include transition-mix($duration: 0s);
    
    opacity: 0;
    visibility: hidden;
  }
}

.nav-open-btn__bar {
  width: 100%;
  height: 5px;
  
  background-color: $dark-theme-color;
  border-radius: 20px;
  
  &:nth-child(1) {
    @include position-absolute($top: 0, $left: 0);
  }
  
  &:nth-child(2) {
    @include position-absolute($top: 10px, $left: 0);
  }
  
  &:nth-child(3) {
    @include position-absolute($top: 20px, $left: 0);
  }
}

/* Demo #1: styles */
$nav-list-offset-vert: 30px;

.nav--offcanvas-1 {
  @include transition-mix();
  
  left: (- $nav-width);
    
  /* opened styles */
  &.js-opened {
    @include transition-mix($property: left);
    left: 0;
    
    opacity: 1;
    visibility: visible;
  }
}

.page__content--offcanvas-1 {
  @include transition-mix();
  
  left: 0;
  
  /* opened styles */
  &.js-opened {
    @include transition-mix($duration: .3s);
    left: $nav-width;
  }
}

/* Demo #2: styles */
.nav--offcanvas-2 {
  @include transition-mix();
  
  left: (- $nav-width);
    
  /* opened styles */
  &.js-opened {
    @include transition-mix($property: left);
    
    left: 0;  
    
    opacity: 1;
    visibility: visible;
  }
}

.page__content--offcanvas-2 {
  @include transition-mix();
  
  transform: scale(1) translateX(0);
  
  &.js-opened {
    transform: scale(.8) translateX($nav-width / 2);
  }
  
}

/* Demo #3: styles */

.nav--offcanvas-3 {
  @include transition-mix();
  
  left: (- $nav-width);
    
  /* opened styles */
  &.js-opened {
    @include transition-mix($property: left);
    
    left: 0;  
    
    opacity: 1;
    visibility: visible;
  }
}

.page__content--offcanvas-3 {
  @include transition-mix();
  
  transform: rotateY(0deg) translateX(0);
  
  &.js-opened {
     transform: translate3d(100px, 0, -600px) rotateY(- 20deg);
  }
}

/* Demo #4: styles */

.nav--offcanvas-4 {
  @include transition-mix($duration: 0s);
  
  max-height: 80%;
  
  transform: rotateY(-75deg) translateX(-50px);
  transform-origin: left center;
  
  /* opened styles */
  &.js-opened {
    max-height: 100%;
    
    transition:
      transform .22s linear 0s,
      opacity .22s linear 0s,
      visibility .22s linear 0s;
    
    transform: rotateY(0) translateX(0);
    transform-origin: left center;
    
    opacity: 1;
    visibility: visible;
  }
}

.page__content--offcanvas-4 {
  @include transition-mix();
  
  left: 0;
  
  /* opened styles */
  &.js-opened {
    left: $nav-width;
  }
}

/* Demo #5: styles */
.nav--offcanvas-5 {
  width: 50%;
  
  &.js-opened {
    @include transition-mix;
    
    width: $nav-width;
    
    opacity: 1;
    visibility: visible;
  }
}

.page__content--offcanvas-5 {
  @include transition-mix();
  
  left: 0;
  
  /* opened styles */
  &.js-opened {
    left: $nav-width;
  }
}
!

JS 

              
                //CODE TO USE ON YOUR WEBSITE - !!! YOU NEED IT

//hide nav open btn when the nav is open, adding/removing open classes to nav and content
var navOpenBtn = document.querySelector('.nav-open-btn');
var navCloseBtn = document.querySelector('.nav__close');
var nav = document.querySelector('.nav');
var pageContent = document.querySelector('.page__content');
var navList = document.querySelector('.nav__list');
var page = document.querySelector('.page');

//open nav
navOpenBtn.addEventListener('click', function() {
  navOpenBtn.classList.add('js-hidden');
  
  nav.classList.add('js-opened');
  
  pageContent.classList.add('js-opened');
});

//close nav
navCloseBtn.addEventListener('click', function() {
  navOpenBtn.classList.remove('js-hidden');
  
  nav.classList.remove('js-opened');
  
  pageContent.classList.remove('js-opened');
});

//closing navigation if click outside it
page.addEventListener('click', function(e) {
  
  var evTarget = e.target;
  
  if((evTarget !== nav) && (nav.classList.contains('js-opened')) && (evTarget !== navOpenBtn) && (evTarget.parentNode !== navOpenBtn)) {
    console.log(navOpenBtn.firstChild);
    
    navOpenBtn.classList.remove('js-hidden');
  
    nav.classList.remove('js-opened');
  
    pageContent.classList.remove('js-opened');
  }
  
});

//DEMO CODE - !!!YOU DON'T NEED IT
var demoBtns = document.querySelectorAll('.demo-btn');

//adding default demo classes
nav.classList.add('nav--offcanvas-1');
pageContent.classList.add('page__content--offcanvas-1');

//change demo on btn click
demoBtns.forEach(function(el, ind) {
  
  el.addEventListener('click', function() {
    
    //add active class to active btn
    demoBtns.forEach(function(el) {
      el.classList.remove('js-active');
    });
    
    this.classList.add('js-active');
    
    //add proper classes for effects
    var effClass = ind + 1;
    
    nav.classList.remove('js-opened');
  
    pageContent.classList.remove('js-opened');
    
    navCloseBtn.classList.remove('js-opened');
  
    navList.classList.remove('js-opened');
    
    navOpenBtn.classList.remove('js-hidden');
    
    nav.classList.remove(nav.classList[1]);
    
    nav.classList.add('nav--offcanvas-' + effClass);
    
    pageContent.classList.remove(pageContent.classList[1]);
    
    pageContent.classList.add('page__content--offcanvas-' + effClass);
    
  });
  
});
!
999px

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