.navigationbar{
  text-align:center;
  width: 100%;
}

#mainmenu li{
  list-style-type: none;
  float:left;
  text-align:center;
  position:relative;
  width: 172.4px;
  border-right: 1px solid;
}

#mainmenu a{
  text-decoration:none;
  background-color: #7A991A;
  color: white;
  display:block; 
  margin: 1px;
  padding: 8px;
}

#mainmenu a:hover, a:active{
  background-color:#006600;
}

#mainmenu li ul{
  display:none;
  padding:0px;
  position:fixed;
}

#mainmenu li li{
  float: none;
}

#mainmenu li:hover ul{
  display:block;
}