header menu item to flash

Hi I love this theme,i love using it.

my site is http://www.recipesaresimple.com

i am using a child theme for simple catch to do customizations.
i have entered the following in custom css for header menu

*----header menu----*/
#header #mainmenu {
	float: left;
	border:1px solid #ccc;
	/*background-color:#fff;*/
	background-color:black;
	margin-top:40px;
	position:relative;
	width:994px;
	z-index:100;
	box-shadow:0 1px 0px #fff;
}

#header #mainmenu ul li a {
	padding: 0 15px;
	display: block;
	/*color: #fff*/;
	color:#d16161!important;
	font-size: 15px;
	line-height: 48px;
	color: #444;
	float: left;
}
#header #mainmenu ul li a:hover, #header #mainmenu ul li.current_page_item a, #header #mainmenu ul li:hover > a {
	/*background-color: #444;*/
	background-color: #e1e5e1;
	/*color: #fff;*/
	color:black!important;
}

I have a customized header menu but i would like one of the menu items, namely ‘share recipes’ to flash to stand out from the others.
How would i go about this?
Thanks in advance.