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HTML 

              
                <nav class="container">
  <div class="row">
    <!-- Menu Left -->
    <div class="six columns">
      <h3><i class="fa fa-home"></i> Your Home</h3>

      <ul class="main-menu">
        <li>
          <h4 class="sub-menu">Gas and Electricity <i class="fa fa-chevron-down closed"></i></h4>

          <ul class="closed">
            <li>Gas and electricity tariffs</li>
            <li>Pay As You Go tariffs</li>
            <li>Quick energy estimate</li>
            <li>Prices and tariff information</li>
            <li>Billing and payment</li>
            <li>Trouble paying your bill</li>
            <li>Your meter</li>
            <li>Give us a meter read</li>
            <li>Moving house</li>
            <li>Pay As You Go</li>
            <li>Switching to us</li>
            <li>FAQs</li>
          </ul>
        </li>
        <li>
          <h4 class="sub-menu">Phone and Broadband <i class="fa fa-chevron-down closed"></i></h4>

          <ul class="closed">
            <li>Phone and Broadband Packages</li>
            <li>Phone Packages</li>
            <li>Prices</li>
            <li>Useful information</li>
            <li>Moving house</li>
            <li>FAQs</li>
          </ul>
        </li>
        <li>
          <h4 class="sub-menu">Heating and Wiring <i class="fa fa-chevron-down closed"></i></h4>

          <ul>
            <li>Shield - Care & Servicing</li>
            <li>Gas Installations</li>
            <li>tado° Smarter Heating</li>
            <li>Discounted Energy Efficient Installs</li>
            <li>FAQs and How To</li>
            <li>Contact Us</li>
            <li>Complaints procedure</li>
          </ul>
        </li>
        <li>
          <h4 class="sub-menu">Being Green <i class="fa fa-chevron-down closed"></i></h4>

          <ul>
            <li>Insulation</li>
            <li>Energy Efficiency</li>
            <li>Energy Saving Tips</li>
            <li>Energy Efficiency Survey</li>
            <li>Feed-In Tariffs</li>
            <li>Green Deal</li>
          </ul>
        </li>
        <li>
          <h4 class="sub-menu">Help and Advice <i class="fa fa-chevron-down closed"></i></h4>

          <ul>
            <li>Billing and Payment</li>
            <li>Tariff Comparison Rate</li>
            <li>Your Meter</li>
            <li>Smart Meters</li>
            <li>iplan</li>
            <li>Safety and Emergencies</li>
            <li>Moving House</li>
            <li>Extra Help</li>
            <li>Contact Us</li>
            <li>Regulatory & Guidance Information</li>
            <li>Treating Customers Fairly</li>
            <li>Complaints Procedure</li>
            <li>FAQs</li>
          </ul>
        </li>
        <li>About Us</li>
      </ul>
    </div>

    <!-- Menu Right -->
    <div class="six columns">
      <h3><i class="fa fa-cogs"></i> Site Options</h3>

      <ul class="site-options">
        <li>Cookies</li>
        <li>Low Graphics Version</li>
        <li>Contact Us</li>
        <li>Careers</li>
        <li>Sitemap</li>
      </ul>
    </div>

  </div>
</nav>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:300,400);
/* Grid System */

* {box-sizing: border-box;}

.container {
  max-width: 1020px;
  position: relative;
  margin: 0 auto;
  padding: 0 10px;
  zoom: 1;
  /* For IE 6/7 (trigger hasLayout) */
}

.container:before,
.container:after {
  content: "";
  display: table;
}

.container:after {
  clear: both;
}

.row {
  zoom: 1;
  /* For IE 6/7 (trigger hasLayout) */
}

.row:before,
.row:after {
  content: "";
  display: table;
}

.row:after {
  clear: both;
}

.columns {
  float: left;
  display: block;
  margin-left: 1.5%;
  margin-bottom: 18px;
  vertical-align: top;
}

.columns:first-child {
  margin-left: 0;
}

.columns.six {
  width: 49.25%;
}

/* Main Body */
html {
  height: 101%; /*added to stop the page jumping left when it adds the scroll bar */
}

body {
  font-family: 'Lato', 'Arial', sans-serif;
  font-weight: 300;
  font-size: 16px;
  line-height: 1.4;
  background: rgba(0, 79, 143, 0.9);
  -webkit-background-size: cover;
  -moz-background-size: cover;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

.column,
.columns {
  color: #ffffff;
  text-align: center;
}

h3 {
  color: #ffffff;
  background: #47525d;
  margin: 20px 0;
  padding: 10px;
}
/* Menu Bar */

header {
  background: #fff;
  padding: 20px;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  -webkit-box-shadow: 1px 1px 2px 3px #ccc;
  /* Safari 3-4, iOS 4.0.2 - 4.2, Android 2.3+ */
  
  -moz-box-shadow: 1px 1px 2px 3px #ccc;
  /* Firefox 3.5 - 3.6 */
  
  box-shadow: 1px 1px 2px 3px #ccc;
  z-index: 1000;
}

.main-menu-icon {
  float: right;
  font-size: 38px;
  cursor: pointer;
}
/* Off Screen Nav */

section.offscreen-menu {
  background: #004F8F;
  background: rgba(0, 79, 143, 0.9);
  position: fixed;
  width: 100%;
  height: 100%;
  height: 100vh;
  overflow-y: scroll;
  padding-top: 100px;
  top: 0;
  left: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-overflow-scrolling: touch;
  -webkit-transform: translate(0, -150%);
  transform: translate(0, -150%);
  transition: all 1s;
  z-index: 500;
}

section.offscreen-menu.open {
  -webkit-transform: translate(0, 0);
  transform: translate(0, 0);
}
/*Menu Options */

h4 {
  padding: 10px 0;
  transition: all 1s;
  cursor: pointer;
}

h4.submenu-open {
  background: #418838;
}

ul.main-menu {
  position: relative;
}

ul.main-menu li,
ul.site-options li {
  margin: 20px 0;
}

ul.main-menu li ul {
  color: #73b73e;
  display: none;
  position: relative;
  max-height: 1000px;
  /*fallback for FireFox */
  
  height: 100%;
}

ul.main-menu li ul.open {
  display: block;
}

ul.main-menu li i {
  transition: all 0.5s;
  position: absolute;
  right: 10px;
}

ul.main-menu li i.closed {
  transform: rotate(0deg);
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
}

ul.main-menu li i.open {
  transform: rotate(-180deg);
  -webkit-transform: rotate(-180deg);
  -moz-transform: rotate(-180deg);
}

@media screen and (max-width: 550px) {
  .columns.six {
    width: 100%;
    margin: 10px 0;
  }
}
!

JS 

              
                // Menu Items Slidetoggle
$('.sub-menu').click(function() {
  $(this).toggleClass('submenu-open').parent('li').siblings('li').children('h4.submenu-open').removeClass('submenu-open');
  $(this).parent().toggleClass('submenu-open').children('ul').slideToggle(500).end().siblings('.submenu-open').removeClass('submenu-open').children('ul').slideUp(500);
$('html, body').animate({
            scrollTop: (0),
        }, "fast"); /*this will scroll upto the top, not sure if I want to use this yet */
});
!
999px

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