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HTML

CSS

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HTML

              
                <h1 style="text-align:center; font-weight: bold; padding: 10px 0;">Responsive menu: resize viewport to less than 768px</h1>
<div class="container container-nav">

  <nav class="top-nav">
    <span class="dropdown-toggle">
      <i class="fa fa-bars"></i> Menu&nbsp;&nbsp;<i class="menu-chevron fa fa-chevron-down"></i>
    </span>
    <ul class="navigation">
      <li class="nav-item"><a href="#" > Item1 </a></li>
      <li class="nav-item"><a href="#"> Item2 </a></li>
      <li class="nav-item"><a href="#" > Item3 </a></li>
      <li class="nav-item"><a href="#"> Item4 </a></li>
      <li class="nav-item"><a href="#"> Item5 </a></li>
      <li class="nav-item"><a href="#"> Item6 </a></li>
      <li class="nav-item"><a href="#"> Item7 </a></li>
      <li class="nav-item"><a href="#"> Item8 </a></li>
      <li class="nav-item"><a href="#"> Item9 </a></li>
      <li class="nav-item"><a href="#"> Item10</a></li>
    </ul>

  </nav>

</div>
<div style="">
  <hr style="width: 250px; "> Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
  has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
  publishing software like Aldus PageMaker including versions of Lorem Ipsum.
</div>
              
            
!

CSS

              
                *,
*:before,
*:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  font-family: Arial;
}

a,
a:hover,
a:visited {
  text-decoration: none;
}

img {
  height: auto;
  max-width: 100%;
}
nav {
  position: relative;
}
.container-nav {
    text-align: center;
    border: 1px solid red;
}

.dropdown-toggle {
  font-weight: bold;
  font-size: 18px;
  color: #fff;
  padding: 0 10px;
  border-radius: 5px 5px 0 0;
  position: absolute;
  left: 20px;
  height: 40px;
  line-height: 40px;
  opacity: 0.9;
  background: #616262;
  z-index: 10000;
}

.navigation {
  /* display: none; */
  font-weight: bold;
  font-size: 18px;
  color: #ffffff;
  list-style: none;
  position: absolute;
  top: 40px;
  left: 20px;
  z-index: 0;
  padding: 5px 10px;
  border-radius: 0 5px 5px 5px;
  opacity: 0.9;
  background-color: #616262;
}
.navigation li {
  //display: list-item;
  float: left;
  clear: left;
  height: 40px;
  line-height: 40px;
  width: 140px;
  border: 1px solid #808080;
  border-radius: 5px;
}

.navigation a:hover,
.navigation a:focus,
.navigation a:active {
  text-decoration: none;
}
.navigation:active,
li:active {
  //background: red;
}

.navigation li a {
  color: #fff;
}

.hiding {
    display: none;
}

@media (min-width: 768px) {
    .container-nav {
        text-align: center;
        border: 1px solid blue;
        
    }
    .dropdown-toggle {
        display: none;
    }
    .navigation {
        display: block;
        width: 100%;
        position: static;
        background-color: #ffffff;
/*        top: auto;
        left: auto;*/
    }  
    .navigation li {

        display: inline-block;
        height: 42px;
        line-height: 42px;
        float: none;
        background-color: #3f030f;
        color: white;
        text-decoration: none;
        border: none;
        border-radius: 5px;
/*        border: 1px solid whitesmoke;*/
        padding: 0 10px;
        width: auto;
    }
}
              
            
!

JS

              
                var elem1 = $(".dropdown-toggle");
var elem2 = $("li:last-child");
var elem3 = $(".navigation");

elem1.click(function() {

  // elem3.delay(100).slideToggle();
  elem3.toggleClass('hiding');
  $(".menu-chevron").toggleClass('fa-chevron-down').toggleClass('fa-chevron-up');
  
});

// if mobile menu is shown and screen is resized to desktop size and back 
// mobile menu must be in hidden state
$(window).resize(function() {
  
  var winwidth = $(window).innerWidth();
  
  if(winwidth < 768) {
    //console.log(winwidth);
    /* $('.navigation').removeClass('showing').removeClass('hiding'); */
    if (!elem3.hasClass('hiding')) {
         elem3.addClass('hiding');
      // if mobile navigation is hidden, the chevron must point down   
      if ($(".menu-chevron").hasClass('fa-chevron-up')) {
        $(".menu-chevron").toggleClass('fa-chevron-up').toggleClass('fa-chevron-down');
     }   
  }
  }
});
              
            
!
999px

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