Need help with Navigation HOVER CSS problem

Okay, I am having a problem editing the Navigation on a Template I am installing. The Navigation has a Hover effect and I want to remove it entirely. However, despite editing the CSS in the style sheet I cannot get the hover effect to vanish. I have spent a couple of days on this now and wonder if there is something simple that I am missing! My fear is that the hover effect is hard-coded somewhere in the php files, which is why I cannot edit it via the CSS.

Can anyone take a quick look at the code and let me know if you spot anything obvious?

Firstly, my test page is up at:

http://capecodscenterforpersonalevolution.com/test/

When you hover over the Navigation you will see a Blue line appear above the menu items. It is THAT blue line I want to remove.

I am using Coller Pro as a Theme.

The original CSS in the template was:

/* =Menu
----------------------------------------------- */

.main-navigation {
	clear: both;
	display: block;
	float: left;
	width: 100%;

	margin-bottom: 0px;
}
#nav-container {
	width: 974px;
	margin: auto;
}
.main-navigation ul {
	list-style: none;
	margin: 0;
	padding-left: 0;
}
.main-navigation li {
	float: left;
	position: relative;
}
.main-navigation a {
	display: block;
	text-decoration: none;
	color: #555;
	text-decoration: none;
	padding: 20px 20px;
	font-weight: bold;
}
.main-navigation a:hover {
	background: #f3f3f3;
	border-top: #0C9 solid 4px;
	padding-top: 16px;
}

/*
.main-navigation .current_page_item > a {
	background: #ddd;
	border-top: solid 3px #222;
	padding-top: 17px;
}
*/

.main-navigation ul ul {
	/*box-shadow: 0 3px 3px rgba(0, 0, 0, 0.2);*/
	display: none;
	float: left;
	position: absolute;
		top: 4.0em;
		left: 0;
	z-index: 99999;
	background: #f3f3f3;
}
.main-navigation ul ul ul {
	left: 100%;
	top: 0;
}
.main-navigation ul ul a {
	width: 200px;
	font-size: 14px;
	font-weight: normal;
	color: #555;
	padding: 8px 20px;
	font-weight: 400;
}
.main-navigation ul ul a:hover {
	border-top: none;
	background: #333;
	color: #eee;
	padding: 8px 20px;
}
.main-navigation ul ul li {
}
.main-navigation li:hover > a {
	color: #333333;
}
.main-navigation ul ul li:hover > a {
	background: #333;
	border-top: none;
	padding: 8px 20px;
	color: #eee;
}
.main-navigation ul ul :hover > a {
}
.main-navigation ul ul a:hover {
}
.main-navigation ul li:hover > ul {
	display: block;
}
.main-navigation li.current_page_item a,
.main-navigation li.current-menu-item a {
}
.td_mobile_menu_wrap {
	padding: 15px 25px;
	text-align: center;
}

I have since changed the relevant hover section to…

.main-navigation a:hover {
	padding-top: 16px;
}

…but still that blue line appears! It is driving me a little crazy. 🙂

Can anyone see what I am doing wrong or offer a suggestion as to where the problem might lie?

All replies appreciated,
Mark