Simple CSS Menu

Simple Horizontal Menu

nav ul ul {
    display: none;
}
nav ul li:hover > ul {
    display: block;
}
nav ul {
    background: linear-gradient(135deg, red, blue);
    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:hover {
    background: #4b545f;
    background: linear-gradient(top, #4f5964 0%, #5f6975 40%);
}
nav ul li {
    float: left;
}
nav ul li:hover {
    background: linear-gradient(top, #bbeeff 0%, #0055bb 40%);
}
nav ul li:hover a {
    color: #fff;
}
nav ul li a {
    display: block;
    padding: 25px 40px;
    color: #fff;
    text-decoration: none;
}
nav ul ul {
    background: #5f6975;
    border-radius: 0px;
    padding: 0;
    position: absolute;
    top: 100%;
}
nav ul ul li {
    float: none;
    border-top: 1px solid #6b727c;
    border-bottom: 1px solid #575f6a;
    position: relative;
}
nav ul ul li a {
    padding: 15px 40px;
    color: #000;
}
nav ul ul li a:hover {
    background: #4b545f;
}
nav ul ul ul {
    position: absolute;
    left: 100%;
    top:0;
}

DEMO