Top Level menu item in dropdown - css

Question

I have a dropdown menu made fully in CSS (no JS). I'd like the top level menu item to stay highlighted when I hover on its dropdown menus but I can't figure out how.
Here is an example of what I'm talking about: when you place your cursor on the dropdown, the top level item goes back to default color...
Could anyone help with that? Is there a rule in CSS that would fix that?
Here is the CSS:
nav {
z-index: 10001;
position: relative;
display: block;
width: 100%;
height: 45px;
text-transform: uppercase;
border-bottom: 1px solid white;
color: white;
text-shadow: none;
text-align: center
}
nav a {
text-decoration: none
}
#topmenu {
position: relative;
text-align: left;
left: 2%
}
nav ul {
white-space: nowrap;
list-style: none;
position: relative;
display: inline-block
}
nav ul ul {
visibility: hidden;
opacity: 0;
-webkit-opacity: 0;
-moz-opacity: 0;
transition: opacity .3s linear,visibility .3s linear;
-webkit-transition: opacity .3s linear,visibility .3s linear;
-moz-transition: opacity .3s linear,visibility .3s linear;
-o-transition: opacity .3s linear,visibility .3s linear
}
nav ul ul li: last-child {
-webkit-border-bottom-right-radius: 6px;
-webkit-border-bottom-left-radius: 6px;
-moz-border-radius-bottomright: 6px;
-moz-border-radius-bottomleft: 6px;
border-bottom-right-radius: 6px;
border-bottom-left-radius: 6px;
border-bottom: 1px solid #afafaf
}
nav ul li a: hover {
padding: 13px 20px;
color: green
}
nav ul ul {
padding: 0;
position: absolute
}
nav ul ul li {
float: none;
position: relative;
border: 1px solid #afafaf;
border-bottom: 1px solid #b7b7b7;
border-top: 1px solid #fff;
background: -webkit-linear-gradient(#eee 0,#d4d4d4 100%);
background: linear-gradient(#eee 0,#d4d4d4 100%);
background: -moz-linear-gradient(#eee 0,#d4d4d4 100%);
background: -o-linear-gradient(#eee 0,#d4d4d4 100%);
-moz-box-shadow: inset 2px 2px 5px #ccc;
-webkit-box-shadow: inset 2px 2px 5px #ccc;
box-shadow: inset 2px 2px 5px #ccc;
filter: progid: DXImageTransform.Microsoft.Shadow(color=#ccc,Direction=134,Strength=5);
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#eeeeee',endColorstr='#d4d4d4')
}
nav ul ul li a {
padding: 13px 20px;
color: #063058
}
nav ul li: hover>ul {
visibility: visible;
opacity: 1;
-moz-opacity: 1;
-webkit-opacity: 1
}
nav ul li {
float: left
}
#topmenu li a: hover {
color: #fff
}
#topmenu li a: hover {
color: green;
background: -webkit-linear-gradient(#eee 0,#d4d4d4 100%);
background: linear-gradient(#eee 0,#d4d4d4 100%);
background: -moz-linear-gradient(#eee 0,#d4d4d4 100%);
-moz-box-shadow: inset 2px 2px 5px #ccc;
-webkit-box-shadow: inset 2px 2px 5px #ccc;
box-shadow: inset 2px 2px 5px #ccc;
filter: progid: DXImageTransform.Microsoft.Shadow(color=#ccc,Direction=134,Strength=5);
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#eeeeee',endColorstr='#d4d4d4')
}
nav ul li a {
display: block;
padding: 13px 20px;
color: white
}
nav ul ul ul {
position: absolute;
left: 100%;
top: 0
}

Answer 1

This works
#topmenu li:hover a {
background: linear-gradient(#EEEEEE 0px, #D4D4D4 100%) repeat scroll 0 0 transparent;
box-shadow: 2px 2px 5px #CCCCCC inset;
color: green;
}
I`ve just copied your code there.

Answer 2

I can't get your website to load so i've just done this fiddle for you with lots of comments expalaining the CSS
I have done this fiddle for you http://jsfiddle.net/kevinPHPkevin/PknRT/
nav ul ul {
display: none;
}