Dropdown Menu simple

http://jsfiddle.net/PiranhaGeorge/kocsqphs/1/

by Roberto Apasajja

HTML

<nav id="site-navigation" class="main-navigation" role="navigation">
    <div class="menu-guides-container">
        <ul id="primary-menu" class="menu">
            <li id="menu-item-114" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-114"><a href="#">Short Header</a>
                <ul class="sub-menu">
                    <li id="menu-item-105" class="menu-item menu-item-type-post_type menu-itemTestitem-105"><a href="#">Guides 11</a></li>
                    <li id="menu-item-106" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-106"><a href="#">Guides 10</a></li>
                    <li id="menu-item-107" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-107"><a href="#">Guides 9</a></li>
                    <li id="menu-item-108" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-108"><a href="#">Guides 7</a></li>
                </ul>
            </li>
            <li id="menu-item-115" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-115"><a href="#">A Medium Header</a>
                <ul class="sub-menu">
                    <li id="menu-item-101" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-101"><a href="#">Guides 15</a></li>
                    <li id="menu-item-102" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-102"><a href="#">Guides 14</a></li>
                    <li id="menu-item-103" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-103"><a href="#">Guides 13</a></li>
                    <li id="menu-item-104" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-104"><a href="#">Guides 12</a></li>
                </ul>
            </li>
            <li id="menu-item-109" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-109"><a...

CSS

.main-navigation {
	position: relative;
	padding-left: 150px;
	float: right;
	width: 100%;
	display: block;
	clear: both;
	background: teal;
	height: 44px;
}

.main-navigation ul {
	list-style: none;
	margin: 0;
	padding-left: 0;
}

.main-navigation li {
	float: left;
	position: relative;
}

.main-navigation a {
	display: block;
	padding: 0.82em 1em;
	font-size: 14px;
	text-decoration: none;
	line-height: 1.5em;
	color: #FFF;
	font-weight: bold;
}

.main-navigation ul ul {
    min-width: 100%;
	white-space: nowrap;
	position: absolute;
	left: -999em;
	background: #2F2F2F;
	z-index: 99999;
	padding: 0;
}

.main-navigation ul ul ul {
	left: -999em;
	top: 0;
}

.main-navigation ul ul a {
}

.main-navigation ul ul li {
	width: 100%;
}

.main-navigation li:hover > a,
.main-navigation li.focus > a {
	color: #FFF;
	background: #2F2F2F;
}

.main-navigation ul ul :hover > a,
.main-navigation ul ul .focus > a {
}

.main-navigation ul ul a:hover,
.main-navigation ul ul a.focus {
		background: #000;
}

.main-navigation ul li:hover > ul,
.main-navigation ul li.focus > ul {
	left: auto;
}

.main-navigation ul ul li:hover > ul,
.main-navigation ul ul li.focus > ul {
	left: 100%;
}

.main-navigation .current_page_item > a,
.main-navigation .current-menu-item > a,
.main-navigation .current_page_item > a:hover,
.main-navigation .current-menu-item > a:hover {
	background: #4D4D4D;
}

.main-navigation .current_page_ancestor > a {
	background: #4D4D4D;
}

.main-navigation ul ul .curremt_page_parent {
	color: green;
	background: #313131;
}