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HTML 

              
                <!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://kit.fontawesome.com/0138c8d5d4.js"></script>
    <link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:400,700&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="style.css">    
    <title>Flexbox Mega Menu</title>
</head>

<body>
    <div class="wrapper">
        <div class="header-container">
            <div class="main-menu-container">
                <ul class="main-menu">
                    <li><a href="#">Home</a></li>
                    <li><a href="#">Advert</a></li>
                    <li><a href="#">Contact</a></li>
                    <li><a href="#">Subscribe</a></li>
                    <li><a href="#">Shop</a></li>
                    <li><a href="#">Ads</a></li>
                </ul>

                <ul class="resources">
                    <li><a href="#"><i class="fas fa-play-circle">&nbsp;</i> Multimedia</a></li>
                    <li><a href="#"><i class="fas fa-print">&nbsp;</i> Print</a></li>
                    <li><a href="#"><i class="fas fa-tablet-alt">&nbsp;</i> Apps</a></li>
                </ul>

                <ul class="login-block">
                    <li><a href="#">Register</a></li>
                    <li><a href="#">Login</a></li>
                </ul>
            </div>
            <div class="highlights">
                <div class="logo">
                    <img src="https://place-hold.it/120/fff/000.png?text=Place logo 120" alt="Newspaper Logo">
                </div>
                <ul class="topics">
                    <li><a href="#">Day Topics</a></li>
                    <li><a href="#">Crisis in Middle East</a></li>
                    <li><a href="#">Election Polls</a></li>
                    <li><a href="#">Springfield Isotopes</a></li>
                    <li><a href="#">Concert in Town</a></li>
                </ul>
                <div class="social-wrapper">
                    <ul class="social">
                        <li><a href="#"><i class="fab fa-facebook"></i></a></li>
                        <li><a href="#"><i class="fab fa-twitter"></i></a></li>
                        <li><a href="#"><i class="fab fa-instagram"></i></a></li>
                    </ul>
                    <div class="search">
                        <input type="search" class="search-box" name="q">
                        <span><i class="fas fa-search"></i></span>
                    </div>
                </div>
            </div>
            <div id="news-menu" class="news-menu">
                <ul class="news-categories">
                    <li class="local">
                        <a href="#">Local</a>
                        <ul class="megamenu-local">
                            <li>
                                <ul class="main-topics-list">
                                    <li><a href="#">Security</a></li>
                                    <li><a href="#">Movility</a></li>
                                    <li><a href="#">Our City</a></li>
                                    <li><a href="#">Downtown</a></li>
                                    <li><a href="#">Ecology</a></li>
                                </ul>
                            </li>
                            <li>
                                <a href="#">
                                    <img src="http://lorempixel.com/640/300/nature/1" alt="city image">
                                </a>
                            </li>
                            <li>
                                <ul class="main-news">
                                    <li><a href="#">Main News #1</a></li>
                                    <li><a href="#">Main News With a Really Really Extraordinary Long Title</a></li>
                                    <li><a href="#">Main News #3</a></li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                    <li class="national"><a href="#">National</a></li>
                    <li class="international"><a href="#">International</a></li>
                    <li class="business"><a href="#">Business</a></li>
                    <li class="sports"><a href="#">Sports</a></li>
                    <li class="opinion"><a href="#">Opinion</a></li>
                    <li class="culture"><a href="#">Culture</a></li>
                    <li class="tendencies"><a href="#">Tendencies</a></li>
                    <li class="technology"><a href="#">Technology</a></li>
                    <li class="entertainment"><a href="#">Entertainment</a></li>
                </ul>
            </div>
        </div>
    </div>
</body>
<script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script>
<script type="text/javascript" src="script.js"></script>
</html>
!

CSS 

              
                /* BASIC RESET STYLES */

html {
    box-sizing: border-box;
    font-size: 16px; 
}

*, *:before, *:after {
  box-sizing: inherit;
}

body, h1, h2, h3, h4, h5, h6, p, ol, ul {
  margin: 0;
  padding: 0;
  font-weight: normal;
}

body {
    margin-top: 30px;
}

ol, ul {
   list-style: none;
}

.hidden-megamenu-local {
  display: none;
}

/* FLEXBOX */

/* Main menu Container */

.main-menu-container,
.main-menu,
.resources,
.login-block {
  display: flex;
}

.main-menu {
  flex-grow: 3;
}

.resources {
  flex-grow: 2;
}

.login-block {
  flex-grow: 1;
}

/* Highlights section */

.highlights,
.topics,
.main-topics-list,
.social,
.search,
.social-wrapper {
  display: flex;
}

.logo {
  flex-basis: 25%;
}

.topics {
  flex-basis: 60%;
}

.topics li {
  flex-basis: 22.5%;
}

.topics li:first-of-type {
  flex-basis: 10%;
}

.social-wrapper {
  flex-basis: 15%;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
}

/* News menu and Mega menu */

.news-menu,
.news-categories,
.megamenu-local, 
.main-news {
  display: flex;
}

.news-menu {
  justify-content: center;
}

.megamenu-local {
  align-items: center;
}

.megamenu-local > li:nth-of-type(odd) {
  flex-basis: 25%;
}

.megamenu-local > li:nth-of-type(even) {
  flex-basis: 50%;
}

.main-topics-list,
.main-news {
  flex-direction: column;
  align-items: center;
}

/* OTHER STYLES */

/* Main menu container */

.main-menu-container {
  background-color: black;
}

.header-container {
  background-image: url(http://lorempixel.com/640/300/abstract/6);
  background-repeat: repeat-x;
}

/* Links and images  */

a {
  display: block;
  text-decoration: none;
  text-transform: uppercase;
  padding: 0.5em 0.5em;
  color: whitesmoke;
  font-family: 'Roboto Condensed', sans-serif;
  font-weight: normal;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Login block links */

.login-block li a {
  border: 1px solid whitesmoke;
  border-radius: 3px;
  background-color: #868282;
  padding: 0 0.8em;
  margin-top: 0.5em; 
 }
 
 .login-block li a:hover {
   background-color: rgb(250, 224, 77);
   color: black;
 }
 
 .login-block li:first-of-type {
   margin-right: 0.5em; 
 }

 /* Logo Image */

 .logo img {
  margin: 0 auto;
}

/* First topic */

.topics li:first-of-type a {
  font-weight: 700;
  letter-spacing: 3px;
}

/* Other borders and margins */

.social i {
  font-size: 1.8em;
}

.search {
  padding: 1em;
}

.search-box {
  background-color: transparent;
  line-height: 1.5em;
  color: whitesmoke;
}

.fa-search {
  color: whitesmoke;
  position: relative;
  right: 2em;
  top: 0.3em;
}

.highlights {
  margin-top: 2em;
}

.topics li {
  border: 1px solid whitesmoke;
  border-top: none;
}

.topics li:first-of-type {
  border-left: none;
}

.social li {
  border-right: 1px solid whitesmoke;
  padding: 0 1em;
}

.social li:last-of-type {
  border-right: none;
}

.news-categories {
  padding-top: 1.5em;
}

.news-categories > li > a {
  font-size: 1.1em;
  font-weight: 700;
}

li.local {
  border-top: 5px solid #9c1f42;
}

li.national {
  border-top: 5px solid #e13249;
}

li.international {
  border-top: 5px solid #db5c72;
}

li.business {
  border-top: 5px solid #96B45C;
}

li.sports {
  border-top: 5px solid #006638;
}

li.opinion {
  border-top: 5px solid #FF9E37;
}

li.culture {
  border-top: 5px solid #6C2869;
}

li.tendencies {
  border-top: 5px solid #332265;
}

li.technology {
  border-top: 5px solid #195EB5;
}

li.entertainment {
  border-top: 5px solid #58C5E0;
}

li.local > a:hover {
  background-color: #9c1f42;
}

li.national > a:hover {
  background-color: #e13249;
}

li.international > a:hover {
  background-color: #db5c72;
}

li.business > a:hover {
  background-color: #96B45C;
}

li.sports > a:hover {
  background-color: #006638;
}

li.opinion > a:hover {
  background-color: #FF9E37;
}

li.culture > a:hover {
  background-color: #6C2869;
}

li.tendencies > a:hover {
  background-color: #332265;
}

li.technology > a:hover {
  background-color: #195EB5;
}

li.entertainment > a:hover {
  background-color: #58C5E0;
}

/* Positioning the mega menu */

.wrapper {
  position: relative;
  width: 80%;
  margin: 0 auto;
}

.megamenu-local {
  position: absolute;
  background-color: rgb(228, 228, 228);
  margin: 0 auto;
  left: 0;
  padding-bottom: 1em;
}

.megamenu-local a {
  color: #838383;
}

.main-news {
  width: 95%;
}

.main-news li {
  border-bottom: 2px inset #838383;
  line-height: 1.8em;
  text-align: center;
}

.main-news li:last-of-type {
  border-bottom: none;
}
!

JS 

              
                /* Replace the class megamenu-local with hidden-megamenu-local in the HTML in order to test the JS */

$('li.local').hover(
   function(){ $('.hidden-megamenu-local').addClass('megamenu-local') },
   function(){ $('.hidden-megamenu-local').removeClass('megamenu-local') }
)

$('.megamenu-local').hover(
   function(){ $('.hidden-megamenu-local').addClass('megamenu-local') },
   function(){ $('.hidden-megamenu-local').removeClass('megamenu-local') }
)
!
999px

Console