У меня не работает hover поможете?

* {
margin:0;
padding:0;
}

body {
font-size: 1.2em;
background-color: #fff;
color: #555;
}

p {
padding: 0 0 20px 0;
line-height: 1.7em;
}

input[type="text"], input[type="password"], input[type="search"] {
color: #5d5d5d;
width: 60%;
padding: 8px;
}

input, textarea {
outline: none;
border: none;
border: solid 1px #f2f2f2;
}

h1, h2 {
font: normal 170% "century gothic", arial;
margin: 0 0 15px 0;
padding: 15px 0 5px 0;
color: #000;
}
h2 {
font-size: 140%;
}

a, a: hover {
outline: none;
text-decoration: underline;
color: #aeb002;

}

ul {
margin: 2px 0 22px 17px;
}

ul lu {
margin: 0 0 6px 0;
padding: 0 0 4px 5px;
line-height: 1.5px;
}

.header {
background-color: darkslateblue;
height: 177px;
font-size: 0.8em;
margin-left: 0px;
margin-right: 0px;
min-width: 900px;
}

.main, .logo, .menubar, .site_content, .footer {
margin-left: auto;
margin-right: auto;
}

.logo {
width: 880px;
padding-bottom: 40px;
}

.logo h1, .logo h2 {
font: normal 300% 'century gothic', arial, sans-serif;
margin: 0 0 0 9px;
}

.logo_text h1, .logo_text h1 a, .logo_text h1 a:hover {
padding: 22px 0 0 0;
color: #fff;
letter-spacing: 0.1em;
text-decoration: none;
}

.logo_text h2 {
font-size: 0.9em;
padding: 4px 0 0 0;
color: #999;
}

.menubar {
width: 900px;
height: 46px;
}

ul.menu {
float: right;
}

ul.menu li {
float: left;
padding: 0 0 0 9px;
list-style: none;
margin: 1px 2px 0 0;
}

ul.menu li a {
font: normal 100% 'trebuchet ms', sans-serif;
display: block;
height: 20px;
padding: 6px 35px 5px 28px;
color: #fff;
text-decoration: none;
}

ul.menu li.selected a {
color: #aeb002;
}

ul.menu li a:hover {
color: #e4ec04;
}

.site_content {
width: 880px;
overflow: hidden;
margin: 20px auto 0 auto;
background-color: white;
}

.sidebar_container {
float: right;
width: 224px;
}

.sidebar {
float: right;
width: 220px;
padding: 5%;
margin: 0 0 16px 0;
border: solid 1px #f2f2f2;
border-radius: 5px;
background-color: #f9f9f9;
}

.btn {
padding: 8px;
background-color: white;
cursor: pointer;
}

.sidebar h2 {
color: #136bc2;
}

.lables_passreg_text {
font-size: 0.7em;
margin-top: 3%;
margin-left: 2%;
}

.sidebar ul {
margin: 0;
}

.sutebar ul li {
list-style-type: none;
margin: 0 0 0 0;
}

.sidebar .rating_sidebar {
float: right;
}