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HTML

              
                                <nav class="megamenu">
    <ul class="megamenu-nav d-flex justify-content-center" role="menu">
        <li class="nav-item">
            <a class="nav-link" href="#">
                <i class="fa fa-home"></i>
                <span class="sr-only">Home</span>
            </a>
        </li>
        <li class="nav-item is-parent">
            <a class="nav-link" href="#" id="megamenu-dropdown-1" aria-haspopup="true" aria-expanded="false">
                Link 1 <i class="fa fa-angle-down"></i>
            </a>
            <div class="megamenu-content" aria-labelledby="megamenu-dropdown-1">
                <div class="container">
                    <div class="row">
                        <div class="col-8 pr-5">
                            <div class="row">
                                <div class="col-6">
                                    <h3 class="">Another title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                    </ul>
                                </div>
                                <div class="col-6">
                                    <h3 class="">Some title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            <hr>
                            <div class="d-flex">
                                <div class="align-self-center pr-4">
                                    Lorem ipsum dolor sit amet consectetur adipisicing elit. Vitae corrupti reprehenderit provident ipsam quibusdam, iste ad amet exercitationem sunt. Impedit libero aperiam ratione reiciendis dolorem itaque aut quas eos labore.
                                </div>
                                <div class="align-self-center">
                                    <a href="#" class="btn btn-outline-primary">Click me</a>
                                </div>
                            </div>
                        </div>
                        <div class="col-4">
                            <img src="//placeimg.com/640/480/any" class="img-fluid mb-3" alt="test image">
                            <p>
                                Lorem ipsum dolor sit amet consectetur adipisicing elit. Autem, expedita sint quis rem amet, a nihil, non sunt ea quasi.
                            </p>
                            <a href="#">See more <i class="fa fa-angle-double-right"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </li>
        <li class="nav-item is-parent">
            <a class="nav-link" href="#" id="megamenu-dropdown-2" aria-haspopup="true" aria-expanded="false">
                Link 2 <i class="fa fa-angle-down"></i>
            </a>
            <div class="megamenu-content" aria-labelledby="megamenu-dropdown-2">
                <div class="container">
                    <div class="row">
                        <div class="col-8 pr-5">
                            <div class="row">
                                <div class="col-6">
                                    <h3 class="">Some title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 4</a>
                                        </li>
                                    </ul>
                                </div>
                                <div class="col-6">
                                    <h3 class="">Another title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem 2</a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            <hr>
                            <div class="d-flex">
                                <div class="align-self-center pr-4">
                                    Lorem ipsum dolor sit amet consectetur adipisicing elit. Vitae corrupti reprehenderit provident ipsam quibusdam, iste ad amet exercitationem sunt. Impedit libero aperiam ratione reiciendis dolorem itaque aut quas eos labore.
                                </div>
                                <div class="align-self-center">
                                    <a href="#" class="btn btn-outline-primary">Click me</a>
                                </div>
                            </div>
                        </div>
                        <div class="col-4">
                            <img src="//placeimg.com/641/430/any" class="img-fluid mb-3" alt="test image">
                            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Autem, expedita sint quis rem amet, a nihil, non sunt ea quasi.</p>
                            <a href="#">Read more <i class="fa fa-angle-double-right"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </li>
        <li class="nav-item is-parent">
            <a class="nav-link" href="#" id="megamenu-dropdown-3" aria-haspopup="true" aria-expanded="false">
                Link 3 <i class="fa fa-angle-down"></i>
            </a>
            <div class="megamenu-content" aria-labelledby="megamenu-dropdown-3">
                <div class="container">
                    <div class="row">
                        <div class="col-8 pr-5">
                            <div class="row">
                                <div class="col-6">
                                    <h3 class="">Another title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                    </ul>
                                </div>
                                <div class="col-6">
                                    <h3 class="">Some title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            <hr>
                            <div class="d-flex">
                                <div class="align-self-center pr-4">
                                    Lorem ipsum dolor sit amet consectetur adipisicing elit. Vitae corrupti reprehenderit provident ipsam quibusdam, iste ad amet exercitationem sunt. Impedit libero aperiam ratione reiciendis dolorem itaque aut quas eos labore.
                                </div>
                                <div class="align-self-center">
                                    <a href="#" class="btn btn-outline-primary">Click me</a>
                                </div>
                            </div>
                        </div>
                        <div class="col-4">
                            <img src="//placeimg.com/640/480/any" class="img-fluid mb-3" alt="test image">
                            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Autem, expedita sint quis rem amet, a nihil, non sunt ea quasi.</p>
                            <a href="#">Read more <i class="fa fa-angle-double-right"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </li>
        <li class="nav-item is-parent">
            <a class="nav-link" href="#" id="megamenu-dropdown-4" aria-haspopup="true" aria-expanded="false">
                Link 4 <i class="fa fa-angle-down"></i>
            </a>
            <div class="megamenu-content" aria-labelledby="megamenu-dropdown-4">
                <div class="container">
                    <div class="row">
                        <div class="col-8 pr-5">
                            <div class="row">
                                <div class="col-6">
                                    <h3 class="">Some title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 4</a>
                                        </li>
                                    </ul>
                                </div>
                                <div class="col-6">
                                    <h3 class="">Another title</h3>
                                    <hr>
                                    <ul class="subnav">
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 1</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Menuitem 3</a>
                                        </li>
                                        <li class="subnav-item">
                                            <a href="#" class="subnav-link">Another menuitem 2</a>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            <hr>
                            <div class="d-flex">
                                <div class="align-self-center pr-4">
                                    Lorem ipsum dolor sit amet consectetur adipisicing elit. Vitae corrupti reprehenderit provident ipsam quibusdam, iste ad amet exercitationem sunt. Impedit libero aperiam ratione reiciendis dolorem itaque aut quas eos labore.
                                </div>
                                <div class="align-self-center">
                                    <a href="#" class="btn btn-outline-primary">Click me</a>
                                </div>
                            </div>
                        </div>
                        <div class="col-4">
                            <img src="//placeimg.com/641/430/any" class="img-fluid mb-3" alt="test image">
                            <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Autem, expedita sint quis rem amet, a nihil, non sunt ea quasi.</p>
                            <a href="#">Read more <i class="fa fa-angle-double-right"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </li>
        <li class="nav-item">
            <a class="nav-link" href="#">
                Link without megamenu
            </a>
        </li>
    </ul>
    <div class="megamenu-background" id="megamenu-background"></div>
</nav>

<div class="megamenu-dim" id="megamenu-dim"></div>

<section class="hero">
    <div class="container pt-4">
        <h1 class="display-2 mb-4">Megamenu</h1>
        <p class="lead">
            Dependencies are: <strong>Bootstrap 4, jQuery, jQuery.hoverIntent, Lodash (debounce and throttle)</strong>
        </p>
        <p class="lead"><em>Should work quite well™  </em>with mouse hover, clicks/keyboard and touch devices.</p>
        <p class="lead">Hover Intent plugin is used to track user mouse movement and not fire the megamenu event if cursor is moved rapidly over the main menu elements.</p>
        <p class="lead">Adjusts the menu background height automatically when resizing the browser window. Calculates menu background height from the tallest megamenu content.</p>
        <p class="lead">Missing responsive styling :(</p>
    </div>
</section>

<section class="bg-light">
    <div class="container">
        <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Nesciunt cumque hic ipsam et. Perferendis voluptatum incidunt maxime eos et officiis exercitationem! Expedita ipsa tenetur porro dolores possimus cum ab sapiente.</p>
    </div>
</section>

<section class="bg-white">
    <div class="container">
        <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Nesciunt cumque hic ipsam et. Perferendis voluptatum incidunt maxime eos et officiis exercitationem! Expedita ipsa tenetur porro dolores possimus cum ab sapiente.</p>
    </div>
</section>
              
            
!

CSS

              
                $body-bg: #fff;
$nav-bg: #007bff;

$z-index-navbar: 15;
$z-index-megamenu-content: $z-index-navbar - 1;
$z-index-megamenu-bg: $z-index-megamenu-content - 1;
$z-index-megamenu-dim: $z-index-megamenu-bg - 1;

$navbar-height: 54px;

body {
    background: $body-bg;
}

section {
    padding: 100px 0;
}

.hero {
    color: #fff;
    background-image: url(//placeimg.com/1500/600/any);
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    
    &:before {
        content: "";
        background: rgba(0,0,0,0.6);
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
    }
    
    .container {
        position: relative;
        z-index: 2;
    }
}

.megamenu {
    background: $nav-bg;
    z-index: $z-index-navbar;

    .megamenu-nav {
        padding: 0;
        margin: 0;

        .nav-item {
            display: block;

            &.is-open {
                > .megamenu-content {
                    visibility: visible;
                    opacity: 1;
                }
                
                > .nav-link {
                    background: #fff;
                    color: #333;
                }
            }
        }

        .nav-link {
            color: #fff;
            padding: 15px 30px;

            &:hover {
                background: #fff;
                color: #333;
            }
        }
    }

    .megamenu-content {
        position: absolute;
        left: 0;
        right: 0;
        top: $navbar-height;
        overflow: hidden;
        visibility: hidden;
        opacity: 0;
        z-index: $z-index-megamenu-content;
        transition: all .3s ease-in-out;

        .container {
            padding: 45px 15px;
        }

        .subnav {
            margin: 0;
            padding: 0;
        }

        .subnav-item {
            display: block;

            .subnav-link {
                padding: 10px 0;
                display: block;
            }
        }
    }
}

.megamenu-background {
    background: #fff;
    position: absolute;
    left: 0;
    top: $navbar-height;
    right: 0;
    height: 0;
    transition: all .3s ease-in-out;
    box-shadow: 0px 10px 20px rgba(0,0,0,0.15);
    z-index: $z-index-megamenu-bg;
}

.megamenu-dim {
    background: rgba(0,0,0,0.6);
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: $navbar-height;
    visibility: hidden;
    opacity: 0;
    z-index: -$z-index-megamenu-dim;
    transition: all .3s ease-in-out;

    body.megamenu-visible & {
        z-index: $z-index-megamenu-dim;
        visibility: visible;
        opacity: 1;
    }
}

              
            
!

JS

              
                const $megamenuParentListItem = $('.megamenu-nav > li.is-parent');

const $megamenuBackground = $('#megamenu-background');

const isTouch = 'ontouchstart' in window || !!(navigator.msMaxTouchPoints);

const handleMenuItemOpenState = (elem) => {
    elem.addClass('is-open');
    elem.find('a').first().attr('aria-expanded', true);
};

const handleMenuItemCloseState = (elem) => {
    elem.removeClass('is-open');
    elem.find('a').first().attr('aria-expanded', false);
};

const openMegamenu = (bgElem, heightVal) => {
    $('body').addClass('megamenu-visible');
    bgElem.height(heightVal);
};

const closeMegamenu = (bgElem, heightVal) => {
    $('body').removeClass('megamenu-visible');
    bgElem.height(heightVal);
};

const $megamenuContentElem = $('.megamenu-nav .megamenu-content');

const getTallestMenuHeight = () => {
    let maxHeight = 0;
    $megamenuContentElem.each((index, item) => {
        if ($(item).outerHeight() > maxHeight) {
            maxHeight = $(item).outerHeight();
        }
    });
    return maxHeight;
}

const debouncedClose = _.debounce(closeMegamenu, 400);
const throttledContentHeightCount = _.throttle(getTallestMenuHeight, 100);

let megamenuContentMaxHeight = 0;

window.onresize = () => {
    megamenuContentMaxHeight = throttledContentHeightCount();
};

$(() => {
    megamenuContentMaxHeight = getTallestMenuHeight();
    
    $megamenuParentListItem.each((index, item) => {
        if (!isTouch) {
            $(item).hoverIntent({
                sensitivity: 10,
                interval: 50,
                over: () => {
                    debouncedClose.cancel();
                    $megamenuParentListItem.removeClass('is-open');
                    handleMenuItemOpenState($(item));
                    openMegamenu($megamenuBackground, megamenuContentMaxHeight);
                },
                out: () => {
                    handleMenuItemCloseState($(item));
                    debouncedClose($megamenuBackground, 0);
                },
            });
        }

        $(item).find('a').first().on('click touch', () => {
            if (!$(item).hasClass('is-open')) {
                $megamenuParentListItem.removeClass('is-open');
                handleMenuItemOpenState($(item));
                openMegamenu($megamenuBackground, megamenuContentMaxHeight);
            } else {
                handleMenuItemCloseState($(item));
                closeMegamenu($megamenuBackground, 0);
            }
        });
    });

    $('#megamenu-dim').on('click touch', (e) => {
        if ($('body').hasClass('megamenu-visible')) {
            e.preventDefault();
            $megamenuParentListItem.removeClass('is-open');
            closeMegamenu($megamenuBackground, 0);
        }
    });
});

              
            
!
999px

Console