#NavigationMenu ul ul {
    display: none;
}

#NavigationMenu ul li:hover > ul {
    display: inline;
}

#NavigationMenu ul {
    background: #efefef;
    background: -ms-linear-gradient(top, #efefef 0, #bbbbbb 100%); /*For IE10*/
    background: -moz-linear-gradient(top, #efefef 0, #bbbbbb 100%);
    background: -webkit-linear-gradient(top, #efefef 0,#bbbbbb 100%);
    background: linear-gradient(top, #efefef 0, #bbbbbb 100%);
    padding: 0 50px;
    border-radius: 5px; /* ie 9*/
    -moz-border-radius: 5px; /* For Firefox */
    -webkit-border-radius: 5px; /* Safari and Chrome */
    list-style: none;
    position: relative;
    display: inline-table;
    font-size: large;
    vertical-align: middle;
}

    #NavigationMenu ul:after {
        content: "";
        clear: both;
        display: block;
    }

    #NavigationMenu ul li {
        float: left;
    }

        #NavigationMenu ul li:hover {
            background: #4b545f;
            background: linear-gradient(top, #4f5964 0%, #5f6975 40%);
            background: -moz-linear-gradient(top, #4f5964 0%, #5f6975 40%);
            background: -webkit-linear-gradient(top, #4f5964 0%,#5f6975 40%);
        }

            #NavigationMenu ul li:hover a {
                color: #fff;
            }

        #NavigationMenu ul li a {
            display: block;
            padding: 25px 40px;
            color: #757575;
            text-decoration: none;
        }

    #NavigationMenu ul ul {
        background: #5f6975;
        border-radius: 0px;
        padding: 0;
        position: absolute;
        top: 100%;
    }

        #NavigationMenu ul ul li {
            float: none;
            border-top: 1px solid #6b727c;
            border-bottom: 1px solid #575f6a;
            position: relative;
        }

            #NavigationMenu ul ul li a {
                padding: 5px 30px; /* Child items size... */
                color: #fff;
            }

                #NavigationMenu ul ul li a:hover {
                    background: #4b545f;
                }

        #NavigationMenu ul ul ul {
            position: absolute;
            left: 100%;
            top: 0;
        }

            #NavigationMenu ul ul ul li:first-child > a {
                -moz-border-radius: 0 10px 0 0;
                -webkit-border-radius: 0 10px 0 0;
                border-radius: 0 10px 0 0;
            }