Menu

HTML

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

            <ul>
                <li><a href="#">Photoshop</a>
                </li>
                <li><a href="#">Illustrator</a>
                </li>
                <li><a href="#">Web Design</a>

                    <ul>
                        <li><a href="#">HTML</a>
                        </li>
                        <li><a href="#">CSS</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="#">Articles</a>

            <ul>
                <li><a href="#">Web Design</a>
                </li>
                <li><a href="#">User Experience</a>
                </li>
            </ul>
        </li>
        <li><a href="#">Inspiration</a>
        </li>
    </ul>
</nav>

CSS

nav ul ul {
    opacity: 0;
    visibility: hidden;
    transition: all .5s ease-in;
    -o-transition: all .5s ease-in;
    -ms-transition: all .5s ease-in;
    -moz-transition: all .5s ease-in;
    -webkit-transition: all .5s ease-in;
}
nav ul li:hover > ul {
    visibility: visible;
    opacity: 1;
}
nav ul {
    background: #355E95;
    box-shadow: 0px 0px 9px rgba(0, 0, 0, 0.15);
    padding: 0 20px;
    border-radius: 10px;
    list-style: none;
    position: relative;
    display: inline-table;
}
nav ul:after {
    content:"";
    clear: both;
    display: block;
}
nav ul li {
    float: left;
}
nav ul li:hover {
    background: #1881B4;
}
nav ul li:hover a {
    color: #fff;
}
nav ul li a {
    display: block;
    padding: 20px;
    color: #ffffff;
    text-decoration: none;
}
nav ul ul {
    background: #355E95;
    border-radius: 0px;
    padding: 0;
    position: absolute;
    top: 100%;
}
nav ul ul li {
    float: none;
    border-top: 1px solid #D5EEFF;
    border-bottom: 1px solid #D5EEFF;
    position: relative;
}
nav ul ul li a {
    padding: 15px 40px;
    color: #fff;
}
nav ul ul li a:hover {
    background: #1881B4;
}
nav ul ul ul {
    position: absolute;
    left: 100%;
    top:0;
}