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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <nav role="navigation" id="nav">
              <input class="trigger" type="checkbox" id="mainNavButton">
              <label for="mainNavButton" onclick>Menu</label>
              <ul>
                <li><a href="#">Home</a></li>
                <li><a href="#">About Us</a>
                    <ul>
                      <li><a href="#">Sub Nav Item</a></li>
                      <li><a href="#">Sub Nav Item</a>
                        <ul>
                          <li><a href="#">Sub Sub Nav Item</a></li>
                          <li><a href="#">Sub Sub Nav Item</a></li>
                          <li><a href="#">Sub Sub Nav Item</a></li>
                          <li><a href="#">Sub Sub Nav Item</a></li>
                        </ul>
                      </li>
                      <li><a href="#">Sub Nav Item</a></li>
                      <li><a href="#">Sub Nav Item</a></li>
                    </ul>
                </li>
                <li><a href="#">Products</a></li>
                <li><a href="#">Blog</a></li>
                <li><a href="#">Specials</a></li>
                <li><a href="#">Contact Us</a></li>
              </ul>
              </ul> 
            </nav>

<h1>Responsive Flexbox Nav with :checked hack</h1>
            <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestiae, dignissimos, distinctio consequatur eos optio recusandae maiores quidem possimus tempora esse reiciendis velit ut consequuntur architecto hic soluta deleniti fugit explicabo.</p>
              
            
!

CSS

              
                $primaryColor: #021320; // dark blue
$secondaryColor: #0F9962; // green
$tertiaryColor: #005292; // light blue

$flex_nav_hoverColor:darken($secondaryColor,5%);
$flex_nav_borderColor: darken($secondaryColor,10%);
$flex_nav_linkColor: white;
$flex_nav_hotdogsColor: white;

$flex_nav_subNavWidth: 12.5em;
$flex_nav_breakpoint: 48em;

body { 
  margin:25px;
  -webkit-animation: bugfix infinite 1s; /* needed for checkbox hack */
  background:$primaryColor;
}
@-webkit-keyframes bugfix { from {padding:0;} to {padding:0;} } /* needed for checkbox hack */

h1, p {
    color:white;
}

#nav {
  position:relative;
  
  ul {
    display:none;
    width:100%;
    list-style:none;
    margin:0px;
    padding:0px;
    
    li {
      a {
        display:block;
        padding:1em;
        background:$secondaryColor;
        color:$flex_nav_linkColor;
        text-decoration:none;
        border-right:1px solid $flex_nav_borderColor;
        &:hover {
          background:$flex_nav_hoverColor;
        }
      }
      &:last-of-type {
        a {
          border-right:0px;
        }
      }
      // 2nd level
      ul {
        li {
          a {
            padding-left:1.5em;
          }
          ul {
            li {
              a {
                padding-left:3.125em;
              }
            }
          }
        }
      }

    } // li
    
  } // ul 
  
  input.trigger {
    position: absolute;
    top: -9999px;
    left: -9999px;
    &:checked ~ ul,&:checked ~ ul li ul {
      display:block !important;
      @media (min-width:$flex_nav_breakpoint){
        /* older flexbox */
        display: -webkit-box;
        display: -moz-box;
        display: box;
        -webkit-box-orient: horizontal;
        -moz-box-orient: horizontal;
        box-orient: horizontal;
      
        /* newer flexbox */
        display: flex;
        flex-direction: row;
      }
    }
  }
  label {
    position:relative;
    display:block;
    min-height:2em;
    padding:.45em;
    font-size:1.1em;
    margin:0;
    cursor:pointer;
    background:$tertiaryColor;
    line-height: 2em;
    color:lighten($primaryColor,80%);
  }
    
  label:after {
    position: absolute;
    right: 1em;  
    top: .2em; 
    content:"\2261";
    font-size:1.8em;
    color:$flex_nav_hotdogsColor;
  }
  
  @media(min-width:$flex_nav_breakpoint){
    ul {
      /* older flexbox */
      //display:block;
      display: -ms-flexbox;
      flex-direction: -ms-row;
      display: -webkit-box;
      display: -moz-box;
      display: box;

      -webkit-box-orient: horizontal;
      -moz-box-orient: horizontal;
      box-orient: horizontal;
      
      /* newer flexbox */
      display: flex;
      flex-direction: row;
      
      li {
        position:relative;
        text-align: center;
        
        /* older flexbox */
        -ms-flex: 1;
        -webkit-box-flex: 1;
        -moz-box-flex: 1;
        box-flex: 1;
        
        /* newer flexbox */
        flex: 1;

        // 2nd level
        ul {
          display:none !important;
          position:absolute;
          top:3.0625em;
          left:0;
          display:block;
          width:$flex_nav_subNavWidth;
          z-index:200;
          li {
            text-align:left;
            ul {
              z-index: 300;
              top:0px;
              left: ($flex_nav_subNavWidth - .1);
              li {
                a {
                  padding-left:30px !important;
                }
              }
            }
          }
        } // ul 2nd level

        &:hover > ul {
          display: block !important;
        }

      } // li 
    } // ul
    label {
      display:none;
    }
  } // breakpoint

} // nav

              
            
!

JS

              
                /* 

Support: IE10+, FF28+

Checkbox hack:
http://timpietrusky.com/advanced-checkbox-hack 

Polyfill for old IE:
http://flexiejs.com/

Warning: Not super accessible - just for fun


*/
              
            
!
999px

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