Не работает :hover в коде

.header {
	background-color: lightgreen;
	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;
}