div.ATCDropMenu {
 height:20px;
 width:100%;
 background-color:gainsboro;
 position:absolute;
 top:120px;
 }

.ATCDropMenu nav ul ul {               /* Do Not Display Levels 2-n */
   display:none;
 }

.ATCDropMenu nav ul li:hover > ul {    /* On Hover - Display Next Level */
   display:block;
 }

.ATCDropMenu nav ul {                  /* Nav Primary CSS Style Controls */
 margin:0;
 top:0;
 background: #dcdcdc;
 background: linear-gradient(top, #dcdcdc 0%, #bbbbbb 100%);
 background: -moz-linear-gradient(top, #dcdcdc 0%, #bbbbbb 100%);
 background: -webkit-linear-gradient(top, #dcdcdc 0%,#bbbbbb 100%);
 box-shadow: 0px 0px 3px rgba(11,202,0,0.25);
 padding: 0 2px;
 border-radius: 10px;
 list-style: none;
 position: relative;
 display: inline-table;
}

.ATCDropMenu nav ul:after {            /* After Hoover - Cleanup and Reset */
  content: "";
  clear: both;
  display: block;
 }

.ATCDropMenu nav ul li {               /* LI Placement Controls */
 float: left;
}

.ATCDropMenu nav ul li:hover {         /* Hover Controls */
  background: LightBlue;
  background: linear-gradient(top, #4b545f 0%, #5f6975 40%);
  background: -moz-linear-gradient(top, #4b545f 0%, #5f6975 40%);
  background: -webkit-linear-gradient(top, #4b545f 0%,#5f6975 40%);
 }

.ATCDropMenu nav ul li:hover a {       /* Hover 'a' Controls */
   color: DarkBlue;
  }

.ATCDropMenu nav ul li a {             /* 'a' Controls */
  display: block;
  padding: 0px 15px;
  color: #81878f;
  text-decoration: none;
 }

.ATCDropMenu nav ul ul {               /* Level 2 */
 background: LightGray;
 border-radius: 0px;
 padding: 10;
 position: absolute;
 top: 100%;
}

.ATCDropMenu nav ul ul li {
  float: none;
  border-top: 1px solid Blue;
  border-bottom: 1px solid #575f6a;
  position: relative;
  width: auto;
 }

.ATCDropMenu nav ul ul li a {
   padding: 0px 15px;
   color: Indigo;
  }

.ATCDropMenu nav ul ul li a:hover {
    background: LightGreen;
   }

.ATCDropMenu nav ul ul ul {
 position: absolute; left: 100%; top:0;
}