CustomMeanMenu.css

/*! #######################################################################

	MeanMenu 2.0.7
	--------

	To be used with jquery.meanmenu.js by Chris Wharton (http://www.meanthemes.com/plugins/meanmenu/)

####################################################################### */

/* hide the link until viewport size is reached */
a.meanmenu-reveal {
	display: none;
}

/* when under viewport size, .mean-container is added to body */
.mean-container .mean-bar {
	float: left;
	width: 100%;
	position: relative;
	background: #29629C;
	padding: 4px 0;
	min-height: 42px;
	z-index: 999999;
}

.mean-container a.meanmenu-reveal {
	width: 22px;
	height: 22px;
	padding: 13px 13px 11px 13px;
	position: absolute;
	top: 0;
	right: 0;
	cursor: pointer;
	color: #fff;
	text-decoration: none;
	font-size: 16px;
	text-indent: -9999em;
	line-height: 22px;
	font-size: 1px;
	display: block;
	/*font-family: Arial, Helvetica, sans-serif;*/
	font-weight: 700;
}

.mean-container a.meanmenu-reveal span {
	display: block;
	background: #fff;
	height: 3px;
	margin-top: 3px;
}

.mean-container .mean-nav {
	float: left;
	width: 100%;
	background: #29629C;
	margin-top: 44px;
}

.mean-container .mean-nav ul {
	padding: 0;
	margin: 0;
	width: 100%;
	list-style-type: none;
}

.mean-container .mean-nav ul li {
	position: relative;
	float: left;
	width: 100%;
}

.mean-container .mean-nav ul li a, .mean-container .mean-nav ul li > span {
	display: block;
	float: left;
	width: 90%;
	padding: 1em 5%;
	margin: 0;
	text-align: left;
	color: #fff;
	border-top: 1px solid #383838;
	border-top: 1px solid rgba(255,255,255,0.5);
	text-decoration: none;
	/*text-transform: uppercase;*/
	font-family: sans-serif;
	font-size: 16px;
}

.mean-container .mean-nav ul li li a, .mean-container .mean-nav ul li li > span {
	width: 80%;
	padding: 1em 10%;
	border-top: 1px solid #f1f1f1;
	border-top: 1px solid rgba(255,255,255,0.25);
	opacity: 0.75;
	filter: alpha(opacity=75);
	text-shadow: none !important;
	visibility: visible;
}

.mean-container .mean-nav > ul li.mean-last a, .mean-container .mean-nav > ul li.mean-last > span {
	border-bottom: none;
	margin-bottom: 0;
}

.mean-container .mean-nav ul li li li a {
	width: 70%;
	padding: 1em 15%;
}

.mean-container .mean-nav ul li li li li a {
	width: 60%;
	padding: 1em 20%;
}

.mean-container .mean-nav ul li li li li li a {
	width: 50%;
	padding: 1em 25%;
}

.mean-container .mean-nav ul li a:hover, .mean-container .mean-nav ul li span:hover {
	background: #252525;
	background: rgba(255,255,255,0.1);
}

.mean-container .mean-nav ul li a.mean-expand {
	margin-top: 1px;
	width: 26px;
	height: 32px;
	padding: 12px !important;
	text-align: center;
	position: absolute;
	right: 0;
	top: 0;
	z-index: 2;
	font-weight: 700;
	background: rgba(255,255,255,0.1);
	border: none !important;
	border-left: 1px solid rgba(255,255,255,0.4) !important;
	border-bottom: 1px solid rgba(255,255,255,0.2) !important;
}

.mean-container .mean-nav ul li a.mean-expand:hover {
	background: rgba(28, 66, 105,0.9);
}

.mean-container .mean-push {
	float: left;
	width: 100%;
	padding: 0;
	margin: 0;
	clear: both;
}

.mean-nav .wrapper {
	width: 100%;
	padding: 0;
	margin: 0;
}

/* Fix for box sizing on Foundation Framework etc. */
.mean-container .mean-bar, .mean-container .mean-bar * {
	-webkit-box-sizing: content-box;
	-moz-box-sizing: content-box;
	box-sizing: content-box;
}


.mean-remove {
	display: none !important;
}

.mean-container ul.dynamic {
  position: inherit;
  left: inherit;
  top: inherit;
  background-color: transparent;
  border: 0px;
  box-shadow: none;
}

.mean-bar > span{
    float: left;
    position: absolute;
    font-size: 1.5em;
    padding: 0 0.5em;
    color: #fff;
}

.mean-container {
	overflow: hidden;
}

Custom CSS for MeanMenued SharePoint2013 Global Navigation.

info(japanese)
http://tasudesign.com/web-desing/mean-menu/