JSFiddle - React, Tailwind, and code Playground

by envira

HTML

<div class="menu style">
  <div class="mobile-nav">
    <div class="menu-btn" id="menu-btn">
      <div></div>
      <span></span>
      <span></span>
      <span></span>
    </div>
    <ul class="menu">
      <!-- Mega Menu start. copy section between comments to create new heading-->
      <li><a href="#">Option 1</a>
        <div class="mega-menu">
          <div class="col-1">
            <h4>Header 1</h4>
            <ol>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
            </ol>
          </div>
          <div class="col-1">
            <h4>Header 2</h4>
            <ol>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
            </ol>
          </div>
          <div class="col-1">
            <h4>Header 3</h4>
            <ol>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
            </ol>
          </div>
          <div class="col-1">
            <h4>Header 4</h4>
            <ol>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
              </li>
              <li><a href="#">Content</a>
          ...

CSS

@font-face {
  font-family: 'raleway';
  src: url(fonts/raleway/raleway.ttf) format('truetype');
  src: url(fonts/raleway/raleway.otf) format('opentype');
  src: url(fonts/raleway/raleway.woff) format('woff');
}
.menu {
  display: block;
  position: relative;
}
.menu,
.menu ul {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative
}
.menu ul a {
  float: left
}
.menu .mega-menu a {
  float: none;
  padding: 0
}
.menu .mega-menu,
.menu .mega-menu ol li {
  opacity: 0;
  visibility: hidden;
  display: none ! important/9;
}
.menu li:hover>.mega-menu,
.menu li:hover>.mega-menu ol li {
  opacity: 1;
  visibility: visible;
  display: block ! important/9
}
.menu ul:after {
  content: "";
  clear: both;
  display: block
}
.menu ul li {
  float: left;
}
/*Main heading css*/

.menu ul li a {
  display: block;
  padding: 14px 20px 15px 20px;
  font-family: 'raleway', arial, sans-serif;
  color: #fff;
  font-size: 1.1em;
  font-weight: bold;
  text-decoration: none
}
/*dropdown section css*/

.mega-menu {
  position: absolute;
  top: 100%;
  padding: 18px 11px;
  background-color: rgba(0, 0, 0, .8)
}
.mega-menu ol {
  list-style: none;
  padding: 0
}
.mega-menu ol li {
  width: 100%;
}
/*dropdown section text css*/

.mega-menu ol li a {
  font-size: .9em;
  line-height: 18px;
}
.mega-menu ol li:hover,
.mega-menu ol li a {
  color: #fff;
  padding: 0;
  background-image: none
}
/*sub header css*/

.mega-menu div h4 {
  font-family: 'raleway', arial, sans-serif;
  font-size: 1.15em;
  font-weight: bold;
  color: #f7b50d;
  border-bottom: 1px solid #e4e4e4;
  padding: 0 0 8px 0;
  margin: 0 0 10px 0
}
.mega-menu .col-1 {
  width: 135px
}
.mega-menu .col-1 {
  float: left;
  margin: 0 9px
}
@media only screen and (max-width: 767px) {
  .menu ul li {
    width: 100%;
  }
  .menu ul li {
    position: relative
  }
  .menu .mega-menu ol li {
    height: 0
  }
  .menu li:hover>.mega-menu ol li {
    height: auto
  }
  .mega-menu,
  .menu ul ul {
    z-index: 100
  }
 ...

JavaScript

jQuery(function($) {
  $('.menu-btn').click(function() {
    $('.menu.style').toggleClass("open");
  })
})