Задаю стиль только для мобильного устройства, а меняется при просмотре на компьютере, что не так?

* {
	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, teaxterea {
	outline: none;
	border: none;
	border: solid 1 px #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 li {
	margin: 0 0 6px 0;
	padding: 0 0 4px 5 px;
	line-height: 1.5em;
}
.header{
	background-color: darkslateblue;
	height: 220px;
	font-size: 0.8em;
	margin-left: 0px;
	margin-left: 0px;
	min-width: 900px;

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

.logo{
	width: 800px;
	padding-bottom: 40px;

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

.logo_text h1, .logo_text h1 a, .logo_text h1 a:hover {
	padding: 22 px 0 0 0;
	color: #fff;
	letter-spacing: 0,1en;
	text-decoration: none;

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

.menubar {
	width: 900px;
	height: 46px;
}
ul.menu {
	float: left;
}
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: 5px 35 px 5 px 28px;
	color: #fff;
	text-decoration: none;

}

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

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

	}
	hr {
		border: solid 1 px #f3f3f3;
	}

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

	}

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

	.sidebar {
		float: right;;
		width: 222px;
		padding: 5%;
		margin: 0 0 16px 0;
		border: solid 5px #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 ui li {
		list-style-type: none;
		margin: 0 0 0 0; 
	}
	.sidebar .rating_sidebar {
		float: right;
	}
	.footer {
		width: 100%;
		height: 100px;
		padding: 28px 0 5px 0;
		text-align: center;
		background-color: darkslateblue;
		color: #a8aa94;
		margin-left: 0px;
		margin-right: 0px;
		min-width: 900px;

	}

.content {
text-align: left;
width: 620px;
padding: 0 0 0 5px;
float: left;
}
 
 .content a {
 	text-decoration: none;
 	}

 	.films_block	{
 		margin-bottom: 5%;
 	}
 	.films_block img {
 		border-radius: 5px;
 		border: solid 5px #dad7d5;
 		width: 22%;
 	}	
 	.posts .posts_content {
 		font-size: 0.8em;
 	}

 	.info_film_page {
 		margin-top: 2%;
 		margin-bottom: 4%;
 	}
 .info_film_page.label {
    font-size: : 1.2em;
   }

 .info_film_page.value {
    font-size: : 1em;
    color: #49945a;
    margin-right: 3%;
   }

   .description_film {
   	margin-bottom: 15%;
}

.description_film img {
	float: left;
	margin-right: 2%;
	border-radius: 5px;
	border: solid 5px #dad7d5;
}
.reviews {
	margin-bottom: 4%;
	font-size: 0.9em;
}
   
   .reviews .reviews_name {
background-color: #7268ad;
color: white;
padding: 1%;
border-top-left-radius: 5px;
border-top-right-radius-radius: 5px;


   }

   .reviews .reviews_text {
   	padding-top: 2%;
   	padding-bottom: 2%;
   	padding-right: 2%; 
   }

   .send {
   	margin-bottom: 4%;
   }
   .send input[type="text"], textarea {
   	border: solid 1px #c3c3c3;
   	margin-bottom: 2%;

   }

   .send input[type="text"] {
   	width: 98%;

   }
   .send textarea {
   	width: 624px;
   	height: 200px;
   }
   .send input[type="submit"] {
   	background-color: #7268ad;
   	padding: 3%;
   	color: white;
   	border-radius: 5px;
   }


   .info_film {
   	margin-bottom: 5%;
   	background-color: #f9f9f9;
   	padding: 5%;
   	height: 270px;
   }

   .info_film img {
   	float: left;
   	margin-right: 2%;
   	border-radius: 5px;
   	border: solid 5px #dad7d5;
   	width: 25%;
   }

   .button {
   	background-color: #7268ad;
   	padding: 2%;
   	color: white;
   	border-radius: 5px;
   	float: right;
   	margin-top: 5%;
   	clear: both;
   	font-size: 0.8em;
   }


   .button a {
   	color: white;
   }

   table {
   	width: 100%;
   	border: solid 1px #f4f4f4;
   }
   td {
   	padding: 2%;
   	border: solid 1px #f4f4f4;
   }

   td img {
   	width: 60px;
   	wertical-align: midle;
   }

   .center {
   	text-align: center;
   }

   .rating {
   	font-weight: bold;
   }
	.footer a {
		color: #a8aa94; 
		text-decoration: none;

	}
	.footer a:hover {
color: #fff;
text-decoration: none;

	}
	.footer p {
		padding: 0 0 10px 0;
	}

	/* CSS Mobile */
	@media only screen
	and (min-device-width : 320px)
	and (min-device-width : 568px) {
		.header {
			    background-color: #257965;
			    min-width: 100%;
			    height: 20%;
			    text-align: center;
		}
		.logo {
			width: 100%;

		}
		.site_content {
			width: 100%;
		}
		.menubar {
			width: 100%;
			height: 100%;
		}
	
	.site_content {
		width: 100%;
		text-align: center;
	}
	.sidebar_container {
		display: none;
	}
	.footer {
		display: none;
	}
	ul.menu {
		float: none;
	}
	ul.menu li {
		float: none;
	}
	.logo h1 {
		font: normal 235% 'century gothic', arial, sans-serif;
	}
	logo h2 {
		font: normal 100% 'century gothic', arial, sans-serif;
		color: white;
	}

	}