#head nav > ul {
	display:table;
    table-layout:fixed;
    box-sizing: border-box;
  	width:100%;
}
#head nav > ul > li {
  display:table-cell;
  text-align:center;
}

#head nav li {
  position:relative;
}
#head nav a {
  padding:10px;
  display:block;
}
#head li > ul {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 100%;
  z-index: 1;
}