body {font-family:Arial;font-size:0.9em}
// body {font: 85% Verdana, Arial, Helvetica, sans-serif;}
// mit submenu
nav li {display: inline;}
nav ul {
    border-top   :1px solid black;
    border-bottom:1px solid black;
    display      : flex;
    list-style   : none;
    margin-top   : 0px;
    margin-bottom: 20px;
    padding-left : 20px;
    margin-left  : 0px;
    background-color: silver;
}
nav ul li {
    display : block;
    position: relative;
    float   : left;
    padding-left : 5px;
    padding-right: 5px;
    line-height  : 20px;
    text-align   : center;
    background-color: silver;
}
nav ul li ul {position:absolute;display: none;
              background-color:silver;left:0px;
              padding-left:0px;}
nav ul li:hover    {background:#09c; color:#fff;}
nav ul li:hover ul {display: block;left:0;}
nav ul li ul li    {white-space: nowrap;}
nav ul li a        {text-decoration:none;}