#nav_menu ul {
list-style-type: none;
position: relative;
}
#nav_menu ul li { float: left; }
#nav_menu ul ul {
display: none;
position: absolute;
top: 100%;
}
#nav_menu ul ul li {
float: none;
position: relative;
}
#nav_menu ul ul li ul {
position: absolute;
left: 100%;
top: 0;
}
#nav_menu ul li.lastitem ul li ul {
position: absolute;
left: -100%;
top: 0;
}
#nav_menu ul li:hover > ul {
display: block;
}
#nav_menu > ul::after {
content: "";
clear: both;
display: block;}
#nav_menu ul {
margin: 0;
padding: 0;
}
#nav_menu ul li a {
text-align: center;
display: block;
width: 176px;
padding: 1em 0;
text-decoration: none;
background-color: blue;
color: white;
font-weight: bold;
}
#nav_menu ul li.lastitem a {
width: 178px;
}
#nav_menu ul li a.current {
color: yellow;
}
#nav_menu ul li a:hover, #nav_menu ul li a:focus {
background-color: grey;}