@media screen and (max-width: 2047px) { /* 1920 */
	
}

@media screen and (max-width: 1919px) { /* 1366 */
	
}

@media screen and (max-width: 1279px) { /* 1024 */

}

@media screen and (max-width: 1023px) { /* 980 */
	.content_block {
		width: 960px;
	}
	
	#nav_menu_open,
	li#nav_menu_close	{
		display: initial;
	}
	
	#nav_menu {
		display: none;
		position: fixed;
		top: 0;
		left: 0;
		z-index: 1;
		height: 100%;
		width: 250px;
		overflow-x: hidden;
		margin: 0;
		padding-left: 40px;
		padding-top: 30px;
		background-color: #111;
	}
	
	#nav_menu > li {
		margin-top: 30px;
	}

	#banner {
		margin: auto;
	}

	#feedback_form input[type=text] {
		width: 95%;
	}
}

@media screen and (max-width: 979px) { /* 640 */
	.content_block {
		width: 620px;
	}
}

@media screen and (max-width: 639px) { /* 480 */
	.content_block {
		width: 460px;
	}
}

@media screen and (max-width: 479px) { /* 320 */
	.content_block {
		width: 310px;
	}
}