CSS (3) & HTML Cut edge

Question

This has already been asked, but I need it in a different way. Please have a look at the image below to see the nav bar I try to realize:

Answer 1

Rough demo: http://jsfiddle.net/W82UV/3/

I think this covers the crux of your difficulties, i.e. the edge skew, drop shadow, and border.

    The top bar


    
        
    
    

        Test
    


#top{  
    background-color: #f0f0f0;
    border-bottom: 1px solid #555;
    box-shadow: 8px 8px 8px #aaa;
}

#container {
    position: relative;
    top: -1px;
    overflow: hidden;
    height: 96px;
}

#background {
    background-color: #f0f0f0;

    position: absolute;
    top: -1px;
    left: -32px;
    border: 1px solid #555;

    width: 400px;
    height: 64px;
    box-shadow: 8px 8px 8px #aaa;

   -webkit-transform: skew(-20deg); 
   -moz-transform: skew(-20deg); 
   -o-transform: skew(-20deg);
   -ms-transform: skew(-20deg); 
   transform: skew(-20deg);
}

Tested in IE 8 (doesn't skew), 9, 10, FF, and Chrome. Note that I would probably rearrange the markup a little to be cleaner for the final solution (better class names and/or IDs), and position everything proportionately.