#position-ad{
background-color:transparent;
}
a:hover{
background-color:orange;
}
.mainmenu{
  overflow:hidden;
  background:#59b4b5;
}
.mainmenu ul{
  margin:0;
  padding:0;
  list-style:none;
}
.mainmenu ul li{
  float:right;
  border-left:1px solid #5da5ca;
  border-right:1px solid #408bb2;
}
.mainmenu ul li:first-child{
  border-left:0px solid;
}
.mainmenu ul li:last-child{
  border-right:0px solid;
}
.mainmenu ul li a{
  color:#fff;
  display:block;
  padding:15px;
}
.mainmenu ul li a:hover{
  background:#2d6d8e;
}