UL {
    display:block;
    list-style-type:none;
    margin:0;
    padding:0;
    border:solid blue 0px;
    background-color:rgba(255,255,255,0.2);
    }
    
LI A {
    display:block;
    min-width:100px;
    color:white;
    text-align:center;
    text-decoration:none;
    }
    
LI A:hover {
    color:black;
    background-color:#E0E0E0;
    }
    
LI:hover {
    }
    
LI:hover>UL {
    display:block;
    }
    
UL UL {
    display:none;
    padding-left:0px;
    }