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HTML

            
              <nav>
      <div class="container">
        <ul class="menu-main">


          <li><a href="">Tab 01</a>
            <div class="menu-sub">
              
              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                </ul>
              </div>

              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>
              </div>

              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>
              </div>

              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>
              </div>
            </div>
          </li>

          <li><a href="">Tab 02</a>
            <div class="menu-sub">
              <div class="menu-col-2">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                </ul>
              </div>

              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>
              </div>

              <div class="menu-col-1">
                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>

                <h3 class="menu-category">Category</h3>
                <ul>
                  <li><a href="">Link 01</a></li>
                  <li><a href="">Link 02</a></li>
                  <li><a href="">Link 03</a></li>
                  <li><a href="">Link 04</a></li>
                  <li><a href="">Link 05</a></li>
                </ul>
              </div>
            </div>
          </li>

          <li><a href="">Tab 03</a></li>
          <li><a href="">Tab 04</a></li>
        </ul>
    </div>
  </nav>
!

CSS

            
              


* {
  box-sizing: border-box;
}

body {
  background: #ddd;
  margin: 0;
  font-family: 'Roboto', sans-serif;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

nav {
  background: #fff;
  box-shadow: 0 0 15px 0 rgba(0,0,0,.10)
}

nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
  text-align: left;
}

nav li {
  display: inline-block;
}

nav a {
  color: #444;
  text-decoration: none;
  display: block;
  padding: .75em 1.75em;
}

nav li:hover {
  background: #444;
}

nav li:hover a {
  color: #fff;
}


.menu-sub {
  position: absolute;
  left: 0;
  background: #444;
  width: 100%;
  display: none;
  color: #fff;
  padding: 2em;
}

nav li:hover .menu-sub {
  display: block;
}

.menu-sub li {
  display: block;
}

.menu-sub a {
  padding: 0;
  margin-bottom: .35em;
}

.menu-sub a:hover {
  text-decoration: underline;
}

.menu-category {
  margin: 2.5em 0 .5em;
}

.menu-category:first-of-type {
  margin-top: 0;
}

.menu-col-1,
.menu-col-2,
.menu-col-3,
.menu-col-4 {
  float: left;
}

.menu-col-1 {
  width: 25%;
}

.menu-col-2 {
  width: 50%;
}
!

JS
!
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