<nav>
    <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">WordPress</a>

            <!-- First Tier Drop Down -->
            <ul>
                <li><a href="#">Themes</a></li>
                <li><a href="#">Plugins</a></li>
                <li><a href="#">Tutorials</a>

                    <!-- Second Tier Drop Down -->
                    <ul>
                        <li><a href="#">Stuff</a></li>
                        <li><a href="#">Things</a></li>
                        <li><a href="#">Other Stuff</a></li>
                    </ul>
                    <!-- Second Tier Drop Down ends-->

                </li>
            </ul>
            <!-- First Tier Drop Down ends -->

        </li>
        <li><a href="#">Graphic Design</a></li>
        <li><a href="#">Inspiration</a></li>
        <li><a href="#">Contact</a></li>
        <li><a href="#">About</a></li>
    </ul>
</nav>
/* Giving a background-color to the nav container. */
nav {
    margin: 100px 0;
    background-color: #E64A19;
    width: 700px;
}

/* Removing padding, margin and "list-style" from the "ul",
 * and adding "position:reltive" */
nav ul {
    padding:0;
    margin:0;
    list-style: none;
    position: relative;
    }

/* Positioning the navigation items inline */
nav ul li {
    margin: 0px -7px 0 0;
    display:inline-block;
    background-color: #E64A19;
    }

/* Styling the links */
nav a {
    display:block;
    padding:0 10px;
    color:#FFF;
    font-size:20px;
    line-height: 60px;
    text-decoration:none;
}

/* Background color change on Hover */
nav a:hover {
    background-color: #000000;
}

/* Hide Dropdowns by Default
 * and giving it a position of absolute */
nav ul ul {
    display: none;
    position: absolute;
    top: 100%;
}

/* Display Dropdowns on Hover */
nav ul li:hover > ul {
    display:inherit;
}

/* Fisrt Tier Dropdown */
nav ul ul li {
    min-width:170px;
    display:list-item;
    position: relative;
}

/* Second, Third and more Tiers
 * We move the 2nd and 3rd etc tier dropdowns to the left
 * by the amount of the width of the first tier.
*/
nav ul ul ul {
    position: absolute;
    top:0;
    left:100%;
}

/* Change ' +' in order to change the Dropdown symbol */
li > a:after { content:  ' +'; }
li > a:only-child:after { content: ''; }
Rerun