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HTML

              
                header
    .menu-container
        nav.off-canvas-menu 
            ul
                li
                    a(href="#") Tasum
                li
                    a(href="#") Aldpol
                    
                li.menu-item-has-children
                    a(href="#") Oughw
                    ul.sub-menu
                        li
                            a(href="#") Shyidra
                        li
                            a(href="#") Randel
                        li
                            a(href="#") Ia'usk
                    // /.sub-menu
                    
                li
                    a(href="#") Swaimim
            // /ul
        // /.off-canvas-menu
        
        nav.main-menu
            ul.second
                li
                    a(href="#") Smedgone
                li
                    a(href="#") Aotaliope
                    
                li.menu-item-has-children
                    a(href="#") Rothiope
                    ul.sub-menu
                        li
                            a(href="#") Delirious Lyric
                        li
                            a(href="#") Cleliopyte
                        li
                            a(href="#") Xioeleia
                    // /.sub-menu
                    
                li
                    a(href="#") Iorireto    
            // /ul
        // /.main-menu
    // /.menu-container
// /header
              
            
!

CSS

              
                // SETTINGS
//-----------

// helper
//--------

// colors
$pink: #E9B4B3;
$pale-pink: #F2E4E1;
$coal: #1D2426;
$teal: #35565D;
$grass: #8AB283;

// shortcuts
$noborder: 0 solid transparent;

// variable definitions
//----------------------
$menu-collapse: 610px;
$a_color: $pale-pink;
$a_color_hover: $pink;
$header_bg: $grass;
$off-canvas_bg: $teal;
$main_menu_bg: $coal;


// FUNCTIONS
//-----------

// squareroot
@function sqrt($r) {
    $x0: 1;
    $x1: $x0;
    @for $i from 1 through 10 {
        $x1: $x0 - ($x0 * $x0 - abs($r)) / (2 * $x0);
        $x0: $x1;
    }
    @return $x1;
}

// MIXINS
//--------

// equilateral triangle
@mixin triangle_eqla($sl, $dir, $c) {
    width: 0;
    height: 0;
    border-style: solid;
    
    @if $dir == right {
        border-color: transparent transparent transparent $c;
    }
    @if $dir == left {
        border-color: transparent $c transparent transparent;
    }
    @if $dir == bottom or $dir == down {
        border-color: $c transparent transparent transparent;
    }
    @if $dir == top or $dir == up {
        border-color: transparent transparent $c transparent;
    }
    @if $dir == right or $dir == left {
        border-width: ($sl/2) (sqrt(3)*($sl/2));
    }
    @if $dir == top or $dir == down or $dir == bottom or $dir == up {
        border-width: (sqrt(3)*($sl/2)) ($sl/2);
    }
}

// flexbox
@mixin flexbox($direction, $wrap, $justify, $align) {
    display: flex;
    flex-direction: $direction;
    flex-wrap: $wrap;
    justify-content: $justify;
    align-items: $align;
}

// STYLING
//---------

// basic styles
body {
    font: {
        size: 16px;
        weight: 400;
        family: Roboto;
    }
    line-height: 1.5;
}

a {
    color: $a_color;
    text-decoration: none;
    &:hover {
        color: $a_color_hover;
        cursor: pointer;
    }
}

// main style
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: $header_bg;
    line-height: 2;
    
    @media screen and (max-width: $menu-collapse){
        @include flexbox(row, wrap, center, center);
    }
        
    // toggle link styling
    .toggle {
        @extend a;
        padding: 6px;
    }
    
    .toggle-link-close {
        position: absolute;
        top: 0;
        right: 0;
    }
    
    .toggle-link {
        @media screen and (min-width: $menu-collapse + 1) {
            display: none;
        }
    }
    
    .toggle-link-off-canvas {
        @media screen and (max-width: $menu-collapse) {
            display: none;
        }
    }
}

// menu container, styles will be applied for the responsive version especially
.menu-container {
    @media screen and (max-width: $menu-collapse) {
        z-index: 100;
        position: fixed;
        top: 0;
        left: -300px;
        height: 100%;
        overflow-y: auto;
        background: $off-canvas_bg;
        width: 300px;
        box-sizing: border-box;
        transition: .3s all ease;
        transform: translate(0, 0);

        &.active {
            transform: translate(300px, 0);
        }
    }
    
    // sub menu styles, are the same as with the off-canvas styling
    .sub-menu {
        border-top: 1px solid rgba($coal, .5);
        border-bottom: 1px solid rgba($coal, .5);
        background: lighten($off-canvas_bg, 5%);
        display: none;
        
        li {
            a {
                box-sizing: border-box;
                @media screen and (max-width: $menu-collapse) {
                    padding-left: 25px;
                }
            }
        }
    }
    
    // clickable triangle to toggle sub menu visibility
    .parent {
        @include flexbox(row, wrap, flex-start, center);
        
        .submenu-opener {
            font-size: 0;
            position: relative;
            width: 20px;
            height: 20px;
            transition: .6s all ease;

            @media screen and (max-width: $menu-collapse) {
                margin-left: 20px;
            }

            @media screen and (min-width: $menu-collapse + 1) {
                margin-left: 5px;
            }
            
            &.sub-menu-is-open {
                transform: rotate(-180deg);
            }
            
            &:after {
                content: '';
                @include triangle_eqla(10px, down, $a_color);
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -20%);
                transition: .3s all ease;
            }
            
            &:hover {
                cursor: pointer;
            
                &:after {
                    border-color: $a_color_hover transparent transparent transparent;
                }
            }
        }
    }
}

// off-canvas navigation
.off-canvas-menu {
    line-height: 2.5;
    
    @media screen and (min-width: $menu-collapse + 1) {
        z-index: 100;
        position: fixed;
        top: 0;
        left: -300px;
        height: 100%;
        overflow-y: auto;
        background: $off-canvas_bg;
        width: 300px;
        box-sizing: border-box;
        transition: .3s all ease;
        transform: translate(0, 0);

        &.active {
            transform: translate(300px, 0);
        }        
    }
    
    a {
        padding: 0 10px;
    }
}

// main menu for responsive and full version
.main-menu {
    @media screen and (max-width: $menu-collapse) {
        border-top: 1px solid darken($off-canvas_bg, 5%);
        line-height: 2.5;

        a {
            padding: 0 10px;
        }
    }
    
    @media screen and (min-width: $menu-collapse + 1) {
        position: fixed;
        width: 100%;
        left: 0;
        right: 0;
        background: $main_menu_bg;
        @include flexbox(row, wrap, space-between, center);
       
        ul {
            @include flexbox(row, wrap, flex-start, center);
        
            li {
                padding: 10px;
            }
        }

        .sub-menu {
            top: 100%;
            position: absolute;
            background: lighten($main_menu_bg, 5%);
        }
    }    
}
              
            
!

JS

              
                $(document).ready(function() {
    var offCanvasToggle = 'toggle-link-off-canvas',
        mainToggle = 'toggle-link',
        close = 'toggle-link-close';

    // add toggle links 
    $('header').prepend('<span class="toggle ' + mainToggle + '">Menu</span>');
    $('.menu-container').prepend('<span class="toggle ' + mainToggle + ' ' + close + '">close</span>');
    $('.off-canvas-menu').prepend('<span class="toggle ' + offCanvasToggle + ' ' + close + '">close</span>');
    $('.main-menu').prepend('<ul class="first"><li><span class="toggle ' + offCanvasToggle + '">Menu Off-Canvas</span></li></ul>');

    // click functions for toggle links to toggle active classes on off-canvas
    $('header .toggle-link').click(function() {
        $('.menu-container').toggleClass('active');
    });

    $('header .toggle-link-off-canvas').click(function() {
        $('.off-canvas-menu').toggleClass('active');
    });

    // add Element for caret to toggle sub-menus
    $('.menu-item-has-children > a').wrap('<span class="parent"></span>');
    $('.menu-container .parent').append('<span class="submenu-opener">open submenu</span>');

    // toggling submenus
    $('.menu-container .submenu-opener').click(function() {
        $(this).toggleClass('sub-menu-is-open');
        $(this).parent().next('.sub-menu').slideToggle();
    });
});
              
            
!
999px

Console