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HTML

CSS

CSS Base

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HTML

              
                <nav role="navigation" class="nav">
  
  <a class="menu-toggle" href="#head-nav">
    <span aria-hidden="true" class="icon-menu"></span><span class="menu-toggle-text"> menu</span>
  </a>
	
  <ul id="main-menu" class="top-nav menu clearfix">
    <li class="menu-item">
      <a href="https://codepen.io">Home</a>
    </li>
    <li class="menu-item">
      <a href="https://codepen.io">About</a>
    </li>
    <li class="menu-item">
      <a href="https://codepen.io">Archives</a>
    </li>
    <li class="menu-item">
      <a href="https://codepen.io">Categories</a>
      <ul class="sub-menu">
        <li class="menu-item">
          <a href="https://codepen.io">Reading</a>
        </li>
        <li class="menu-item">
          <a href="https://codepen.io">Writing</a>
        </li>
        <li class="menu-item">
          <a href="https://codepen.io">Arithmatic</a>
        </li>
        <li class="menu-item">
          <a href="https://codepen.io">Something Long</a>
        </li>
        <li class="menu-item">
          <a href="https://codepen.io">Something Else</a>
        </li>
      </ul>
    </li>
    <li class="menu-item">
      <a href="https://codepen.io">Contact</a>
    </li>
  </ul>
  
</nav>
              
            
!

CSS

              
                @import "compass/css3";

/****
SETUP
****/
@import url(https://fonts.googleapis.com/css?family=Quattrocento+Sans);

$menucolour:#333;
$highlight:#eeeeaa;
$lighttext:#eee;

/*
There used to be a menu icon loaded as a (part of a wasteful) font here. It isn't hosted anymore. Such is life.
*/
[class^="icon-"]:before, [class*=" icon-"]:before {
  //font-family: 'symbolset';
  font-style: normal;
  speak: none;
  font-weight: normal;
  vertical-align:top;
}
.icon-menu:before {
  content: "🍔";
}


////


body{
  background:#ddc;
  font-family: 'Quattrocento Sans', Helmet, Freesans, Tahoma, Geneva, sans-serif;
}

a{
  @include transition(color 800ms ease-in-out, background 800ms ease-in-out); 
}

.nav {
  padding:2em 0;
  
  font-size:1em;
  letter-spacing:0.1em;
  text-align: center;

	.menu-toggle{
    position:relative;
    z-index:2;
		display: block;
		margin:0;
		padding: 0.5em 0;
    
		background-color:#ddc;
    
    text-decoration: none;
		text-align:center;
		font-size:1.4em; 
		color:$menucolour;

		&:hover, &:focus{
      color:$lighttext;
			background-color: darken($menucolour, 2%);
		}
	}

	.menu-toggle-text{
		font-size:0.55em;
		display:block;
	}

	.no-js & .menu-toggle{
		display:none;
	}

	.expanded-menu-toggle{
		color:$highlight;
		background-color: darken($menucolour, 2%);
	}

	.no-fontface & .icon-menu:before{
		display:none;
	}
}


	/* .menu is visually hidden by default */
.menu {
  position:relative;
  z-index:1;
  background-color:$menucolour;
  border: 0; 
  margin: -1px auto; 
  overflow: hidden; 
  padding: 0; 
  max-height:1px; 
  min-height:0; 
  clip: rect(0 0 0 0);
  @include box-shadow(inset 0 0 3px 3px rgba(0, 0, 0, 0.2));
	
  @include transition(max-height 600ms ease-out, 
    min-height 600ms ease-in, 
    padding 600ms ease-in);
			
  li {
    a {
      display: block;
      padding: 10px 0;
      
      background-color: transparent;
      
      text-decoration: none;
      text-align:center;
      font-size:1.2em; 
      color:$lighttext;
      
      @include border-radius(2px);
      
      &:hover, &:focus {
        color:$highlight;
        background:lighten($menucolour, 10%);
      }
    }
    
    /* no sub menus for mobile */
    ul.sub-menu, ul.children {   
      display:none;
    }
  } /* end .menu li */
} /* end .menu */

	.no-js .menu, .expanded-mobile-menu{
		@include transition(max-height 800ms ease-in, 
    min-height 500ms ease-out, 
    padding 400ms ease-in);

	    /*min/max heights allow me to css transition to height auto for WordPress menus with unknown number of items*/
	    clip: auto;
	    min-height:8em;
	    max-height:100em;
	    padding:0.5em 0;
	}


@media only screen and (min-width: 30.1em) { /*481 ish px*/
  
	.menu {
			li {
				float:left;
				width:50%;
    	}
  	}
  
}


@media only screen and (min-width: 48em) {
  
  .nav {
    .menu-toggle{
      display:none;
    }
	}

	.menu, .no-js .menu, .expanded-mobile-menu {
    /* no longer hidden by default! */
		margin:0;
		min-height:0;
		max-height:999em;
		@include border-radius(0);
		overflow:visible;
		padding:0.7em 0;
		background:$menucolour;
		@include box-shadow(inset 0 0 3px 3px rgba(0, 0, 0, 0.2));
			
    li {
      float:none;
      width:auto;
      display:inline-block;
      position: relative;
      vertical-align:middle;
      
      .lt-ie8 &{
        /* inline-block fix for old ie (relevant if they're served larger media queries in an IE stylesheet or something similar...*/
      	display:inline;
        zoom:1;
      }
				
      a {
        padding:0.3em 1em;
        color:$lighttext;
        
        &:hover, &:focus {
          color: $highlight;
          background: lighten($menucolour, 2%);
        }
      }
      
      /* DROP DOWNS */
      ul.sub-menu,
        ul.children {
        display:block;
        position: absolute;
        z-index: 2;
        top: 100%;
        left:0;
        white-space:nowrap;
        
        @include transition(max-height 400ms ease-out,
          min-height 500ms ease-in, 
          padding 500ms ease-out, 
          opacity 500ms ease-in);
        
        background:lighten($menucolour, 2%);
        text-align:left;
        @include border-radius(0 4px 4px 4px);
        
        /* visually hidden */
        opacity:0;
        border: 0; 
        margin: -1px 0; 
        overflow: hidden; 
        padding: 0; 
        max-height:1px; 
        min-height:0; 
        
        li {
          display:block;
          padding:0.2em 0.4em 0;
          a {
            font-size:1em;
            padding:0.2em 0.5em 0.2em 0.8em;
            display:block;
            line-height:1.5;
            margin:0;
            text-align:left;
            background:transparent;
							
							&:hover,
							&:focus {
								background:lighten($menucolour, 4%);
							}
						}
						&:last-child {
							a {
								border-bottom: 0;
							}
						}
						/* could go deeper here... */
					}
				}
				
      /* showing sub-menus */
      &:hover ul, &.focused ul {
        @include transition(max-height 800ms ease-in,
          min-height 500ms ease-out, 
          padding 500ms ease-out, 
          opacity 800ms ease-out);
        /* again using min/max heights to deal with unknown length of lists */
        
        min-height:8em;
        max-height:100em;
        padding:0.4em 0;
        opacity:1;
        
        ul{
          min-height:0;
          padding:0;
        }
      }

      &:hover > a{
        background:lighten($menucolour, 2%);
      }
				
		} /* end .menu ul li */
	} /* end .menu */
  
}/* end media query*/


              
            
!

JS

              
                /*
Responsive nav menu with sub menus only on larger screens.

This is more than three years old now - please take it with a big pinch of salt - there are better ways to achieve the same thing!
*/

/**********
MOBILE MENU
**********/
$('.menu-toggle').click(function(e){
  //click event for left clicks only! http://www.jacklmoore.com/notes/click-events
  if (!(e.which > 1 || e.shiftKey || e.altKey || e.metaKey)) {
    e.preventDefault();
    if($(this).parent().find('.menu').hasClass('expanded-mobile-menu')){
      $(this).removeClass('expanded-menu-toggle').parent().removeClass('nav-expanded').find('.menu').removeClass('expanded-mobile-menu');
    }else{
      $(this).addClass('expanded-menu-toggle').parent().addClass('nav-expanded').find('.menu').addClass('expanded-mobile-menu');
    }
  }
});
              
            
!
999px

Console