body, 
.menu,
.sub-menu {
    margin: 0;
    padding: 0;
}
.clearfix:after{
    content: '.';
    display: block;
    clear: both;
    height: 0;
    line-height: 0;
    font-size: 0;
    visibility: hidden;
    overflow: hidden;
}
.menu,
.sub-menu {
    list-style: none;
    /* background: #000; */
}
.sub-menu {
    /* background: #444; */
}
.menu a {
    text-decoration: none;
    display: block;
    padding: 10px;
    color: #fff;
    font-family: sans-serif;
    font-size: 14px;
    /* text-transform: uppercase; */
    /* font-weight: 700; */
}
.menu li {
    position: relative;
}
.menu > li {
    /* float: left; */
}
.menu > li:hover {
    /* background: #444; */
}
.menu li:hover > .sub-menu {
    display: block;
}
.sub-menu {
    display: none;
    position: absolute;
    min-width: 150px;
}
.sub-menu li:hover {
   /* background: #555; */
}
.sub-menu .sub-menu {
    top: 0;
    left: 100%;
}