JS FIDDLE
HTML
<nav>
<ul class="dropdown">
<li class="drop"><a href="#">Team Profile</a>
<ul class="sub_menu">
<li><a href="#">Chelsea</a></li>
<li><a href="#">Man City</a></li>
<li><a href="#">Southampton</a></li>
<li><a href="#">Man Utd</a></li>
<li><a href="#">Arsenal</a></li>
<li><a href="#">Liverpool</a></li>
<li><a href="#">West Ham</a></li>
<li><a href="#">Newcastle</a></li>
<li><a href="#">Leichester</a></li>
<li><a href="#">QPR</a></li>
<li><a href="#">Burnley</a></li>
<li><a href="#">Aston Villa</a></li>
<li><a href="#">Stoke City</a></li>
<li><a href="#">Crystal Palace</a></li>
<li><a href="#">Hull City</a></li>
<li><a href="#">Sunderland</a></li>
<li><a href="#">Tottenham Hotspur</a></li>
<li><a href="#">Everton</a></li>
<li><a href="#">Swansea</a></li>
<li><a href="#">West Brom</a></li>
</ul>
</li>
</li>
</ul>
</nav>
CSS
body{
margin: 0px;
padding: 0px;
background: #000;
font-family: 'Lato', sans-serif;
}
h1{
margin: 2em 0px;
padding: 0px;
color: #fff;
text-align: center;
font-weight: 100;
font-size: 50px;
}
nav{
width: 750px;
margin: 1em auto;
}
ul{
margin: 0px;
padding: 0px;
list-style: none;
}
ul.dropdown{
position: relative;
width: 100%;
}
ul.dropdown li{
font-weight: bold;
float: left;
width: 180px;
position: relative;
background: #ecf0f1;
}
ul.dropdown a:hover{
color: #000;
}
ul.dropdown li a {
display: block;
padding: 20px 8px;
color: #34495e;
position: relative;
z-index: 2000;
text-align: center;
text-decoration: none;
font-weight: 300;
}
ul.dropdown li a:hover,
ul.dropdown li a.hover{
background: #3498db;
position: relative;
color: #fff;
}
ul.dropdown ul{
display: none;
position: absolute;
top: 0;
left: 0;
width: 180px;
z-index: 1000;
}
ul.dropdown ul li {
font-weight: normal;
background: #f6f6f6;
color: #000;
border-bottom: 1px solid #ccc;
}
ul.dropdown ul li a{
display: block;
color: #34495e !important;
background: #eee !important;
}
ul.dropdown ul li a:hover{
display: block;
background: #3498db !important;
color: #fff !important;
}
.drop > a{
position: relative;
}
.drop > a:after{
content:"";
position: absolute;
right: 10px;
top: 40%;
border-left: 5px solid transparent;
border-top: 5px solid #333;
border-right: 5px solid transparent;
z-index: 999;
}
.drop > a:hover:after{
content:"";
border-left: 5px solid transparent;
border-top: 5px solid #fff;
border-right: 5px solid transparent;
}
Javascript
/*
*
* Credits to http://css-tricks.com/long-dropdowns-solution/
*
*/
var maxHeight = 400;
$(function(){
$(".dropdown > li").hover(function() {
var $container = $(this),
$list = $container.find("ul"),
$anchor = $container.find("a"),
height = $list.height() * 1.1, // make sure there is enough room at the bottom
multiplier = height / maxHeight; // needs to move faster if list is taller
// need to save height here so it can revert on mouseout
$container.data("origHeight", $container.height());
// so it can retain it's rollover color all the while the dropdown is open
$anchor.addClass("hover");
// make sure dropdown appears directly below parent list item
$list
.show()
.css({
paddingTop: $container.data("origHeight")
});
// don't do any animation if list shorter than max
if (multiplier > 1) {
$container
.css({
height: maxHeight,
overflow: "hidden"
})
.mousemove(function(e) {
var offset = $container.offset();
var relativeY = ((e.pageY - offset.top) * multiplier) - ($container.data("origHeight") * multiplier);
if (relativeY > $container.data("origHeight")) {
$list.css("top", -relativeY + $container.data("origHeight"));
};
});
}
}, function() {
var $el = $(this);
// put things back to normal
$el
.height($(this).data("origHeight"))
.find("ul")
.css({ top: 0 })
.hide()
.end()
.find("a")
.removeClass("hover");
});
});
JS FIDDLE
Credits to: Larry Geams and attribution to http://css-tricks.com/long-dropdowns-solution/