Почему обрезает правый край блоков?

*{
	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: uderline;
color: #aeb002;
}

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

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

.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: 800px;
	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: 0 0 0 9px;
}
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: fight;
	width: 222px;
	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: #136cb2;
}
.lables_passreg_text  {
font-size: 0.7em;
margin-top: 3%;
margin-left: 2%;
}

.sidebar ul {
margin: 0;
}
.sidebar ul li {
list-style-type: none;
margin: 0 0 0 0;
}
.sidebar .rating_sidebar {
float: right;
}

.footer {
	width: 100%;
	height: 100%;
	padding: 28px 0 5px 0;
	text-align: center;
	background-color: darkslateblue;
	color: #a8aa94;
	margin-left: 0px;
	margin-right: 0px;
	min-width: 900px;
}