Show a triangle below selected menu item - html

Question

I'd like to show a little triangle (similar as my tag box) below the selected menu item. I've tried various things without success, see http://jsfiddle.net/7zRVU/1/
How could I do that? Many thanks
nav {
float: right;
margin: 20px auto;
width: 100%;
}
nav ul {
margin-right: -4px;
margin-left: 5px;
text-align: right;
}
nav ul li {
display: inline-block;
margin-right: -4px;
margin-left: 5px;
vertical-align: top;
}
nav a {
padding: 4px 8px;
text-decoration: none;
color: rgba(255,255,255,1) !important ;
background: rgba(0,0,0,0.25);
font-weight: 300;
text-transform: uppercase;
letter-spacing: 1.5px;
font-size: 14px;
font-weight: 400;
}
nav a:hover {
background: rgba(0,0,0,0.35) !important ;
}
.activeNav {
background: rgba(0,0,0,0.35) !important ;
}
nav ul li ul {
position: absolute;
display: block;
margin-top: 5px;
background: none;
padding-top: 5px
}
nav ul li ul li {
display: block;
float: none;
margin: 0;
padding: 0
}
nav ul li ul li a {
display: block;
text-align: left;
color: rgba(255,255,255,0.9) !important ;
text-shadow: 0 1px rgba(0,0,0,0.33) !important ;
padding: 10px
}
nav ul li ul li a:hover {
background: rgba(20,150,220,0.5) !important ;
color: white;
text-shadow: 0 1px rgba(0,0,0,0.5)
}
.hover a {
display: block;
}
.hover span {
color: rgba(255,255,255,0.9);
background: rgba(20,150,220,0.5);
border-radius: 5px;
position: absolute;
display: block;
margin: 5px 0 0 -57px;
padding: 10px;
font-size: 13px;
font-weight: 300;
letter-spacing: 1.5px;
text-transform: uppercase;
text-align: center;
cursor: default;
}
li.selected a{
border-bottom: 1px solid rgba(16,65,145,0.9);
}
li.selected a:after {
top: 100%;
left: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(136, 183, 213, 0);
border-top-color: #3A7CDB;
border-width: 10px;
margin-left: -10px;
}
.tagbox {
top: -10px;
left: 60%;
position: absolute;
background-color: #3A7CDB;
background-image: linear-gradient(to bottom, #518CDE, #3A7CDB);
background-repeat: repeat-x;
padding: 10px 20px;
width: 250px;
margin-left: 0px;
text-align: center;
color: #fff;
margin-top:140px;
}
.tagbox:after {
top: 100%;
left: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(136, 183, 213, 0);
border-top-color: #3A7CDB;
border-width: 10px;
margin-left: -10px;
}

Answer 1

Here's an update to your fiddle - http://jsfiddle.net/7zRVU/4/1
You have actually done it, but you just need a "position:relative;" to your "selected" class, so the arrow to be absolutely positioned with it, and then, just change the position of the arrow to "top: height of the selected item"
.selected {
position: relative;
}
li.selected a:after {
top: 23px;
left: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(136, 183, 213, 0);
border-top-color: #3A7CDB;
border-width: 10px;
margin-left: -10px;
}