body {
	margin: 0px;
	padding: 0px;
	font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
	font-size: 18px;
	background: lightgrey;
	line-height: 1.5em;
}

p {
	margin: 0 0 25px 0;
}

h2, h3 {
	margin: 0 0 25px 0;
}

img {
	margin: 30px auto 30px;
	max-width: 700px;
}

.header {
	font-family: "Verdana", sans-serif;
	margin: 0px auto;
	padding:0px;
	background-color: #000000;
	width:100%;
}

.menu {
	padding: 0px;
	display: flex;
    flex: 10 1 auto;
    justify-content: center;
    margin-bottom: 0px;
}

.menu .menu-point {
	margin: 0px 20px;
	padding: 20px;
	font-size: 16px;
	text-decoration: none;
	color: white;
	display: inline-block;
}

.menu .menu-point:hover {
	transition-duration: 0.5s;
	background: rgb(35, 35, 35);
	color: rgb(218, 165, 32);
}

article {
	padding:30px 30px 30px 300px;
	max-width:100%;
	background: white;
	
}

.text-position {
	padding: 30px 150px 30px 130px;
}


.link-arrow {
    position: fixed;
    top: 50%;
    width: 80px;
    height: 80px;
    margin-top: -45px;
    outline: 0;
    border-radius: 50px;
}

.link-arrow:hover {
	background-color: hsla(0,0%,85%,.3);
	transition-duration: 0.2s;
}

.arrow-left {
	left: 325px;
}

.arrow-right{
	right:70px;
}

.arrow {
	font-size: 50px;
    position: absolute;
    top: 68%;
    margin-top: -33px;
    width: 100%;
    text-align: center;
    text-decoration: none;
    color: #7e7e7e;
}

.back_to_top {
	position: fixed;
	bottom: 60px;
	right: 40px;
	z-index: 9999;
	width: 70px;
	height: 30px;
	padding: 20px;
	text-align: center;
	line-height: 30px;
	background: #f5f5f5;
	font-size: 18px;
	color: #444;
	cursor: pointer;
	border-radius: 2px;
	display: none;
}

.back_to_top:hover {
  background: #e9ebec;
  transition-duration: 0.3s;
}

.back_to_top-show {
  display: block;
}

.laboratory-content {
	width: 80%;
	margin: 50px auto;
	padding: 50px;
	font-family: "Arial", sans-serif;
	box-shadow: 0 0 20px black;
	background: white;
}

article h1 {
	margin: 25px 0 51px 0;
	text-align: center;
	font-size: 2em;
	line-height: 1.5em;
}

article h2 {
	margin: 40px 0;
	text-align: center;
	font-size: 1.5em;
	line-height: 1.2em;
}

article h3 {
	margin: 30px 0;
	text-align: center;
	font-size: 1.2em;
}

article h4 {
	margin: 30px 0;
	font-size: 19.5px;
}

article ul,ol {
	margin: 0px 20px 0px 20px;
}

article ul li a {
	margin: 0px;
	padding: 10px;
	text-decoration: none;
	color: black;
	display: inline-block;
}

.tags-text {
	padding: 0 5px;
	color: #F3240E;
	background: #EEEEEE;
	border-radius: 5px;
	border: 1px solid #E1E1E8;
}

.link-text {
	padding: 0px;
	color: #269B26;
	text-decoration: none;
}

.link-text:hover {
	text-decoration: underline;
}

.specification {
	background: #FFFFCC;
	border: 5px solid #F0E68C;
}

.attention {
	background: #FDD;
	border: 5px solid #FFB2B2;
}

.exercise {
	background: #d3defe;
	border: 5px solid #9BB5FC;
}

.self-control {
	background: #D8F3C9;
	border: 5px solid #ABE48A;
}

.white {
	background: #f0f0f0;
	border: 5px solid #bfbfbf;
}

.greyblok {
	margin: 0px 0px 25px 0px;
	padding: 10px;
	text-decoration: none;
	color: black;
	border-radius: 15px;
	border: 3px solid #a0a0a0;
	background: #d2d2d2;
}

.blue-text {
	color: #22A9B0;
	font-size: 1.3em;
	font-family: "verdana", sans-serif;
}

.greenline {
	border-left: 5px solid #429445;
    margin-left: 2px;
    padding-left: 20px;
}

.greyline {
	border-left: 2px solid #505050;
    margin-left: 0px;
    padding-left: 10px;
    border-bottom: 2px solid #505050;
    margin-bottom: 110px;
    padding-bottom: 10px;
}

.grey {
	background: #dbdedf;
}

.code {
	font-family: verdana, arial, sans-serif;
	margin: 0 0 25px 20px;
	padding: 10px;
	text-decoration: none;
	color: black;
	border-radius: 15px;
	border: 3px solid #BABABA;
	display: inline-block;
	background: #EEEEEE;
}
/*блок-кода*/
.tag {
	color: #F3240E;
}
/* теги html*/
.atributs {
	color: #006561;
}
/* атрибуты тегов*/
.atributs-item {
	color: #699B00;
}
/*аргументы атрибутов и аргументов*/
.comment {
	color: #0B680B;
}
/*коментарии в html*/
.code-js {
	color: #5590C0;
}
/*код js*/
.js-numbers {
	color: #A52164;
}

.container {
	margin: 0 0 25px 0;
	padding: 20px;
	display: block;	
}

.container > p:last-child {
	margin: 0px;
}

.container > .code:last-child {
	margin: 0 0 0 25px;
}

table {
	margin: 0px auto 25px;
	border: 3px solid #BABABA;
	text-decoration: none;
	border-collapse: collapse;
}

table td{
	padding: 10px;
	text-align: center;
}

.point {
	font-size: 30px;
	font-weight: bold;
}

.red-highlighter {
	color: red;
}

.blue-highlighter {
	color: blue;
}

.green-highlighter {
	color: green;
}

.size-highlighter{
	font-size: 25px;
}

.highlighter{
	font-family: verdana, sans-serif;
}

.contents-lectures-on_top {
	top: 0px !important;
}

.contents-lectures {
	position: fixed;
	height: 100vh;
	padding: 10px;
	background: #f5f2f0;
	width: 280px;
	border-right: 1px solid #d5d2d0;
	
}

aside h1 {
	margin-bottom:1em;
	text-align: center;
	font-size: 1em;
}

aside {
	font-family: "verdana", sans-serif;
}

aside .point-first {
	font-size: 15px;
}

aside .point-second {
	font-size: 14px;
}

aside ul {
	margin: 0px 20px 0px 0px;
}

aside ul li {
	list-style-type: none;
}

aside ul li:hover a{
	color: #FF6700;
}

aside ul li a {
	margin: 0px;
	padding-bottom: 10px;
	color: black;
	text-decoration: none;
	display: inline-block;
}

.laboratory-footer {
	font-family: verdana,sans-serif;
	font-size: 14px;
	margin: 0px;
	padding: 50px;
	max-width: 100%;
	height: 200px;
	min-height: 100%;
	background: dimgray;
}

.page-footer {
	font-family: verdana,sans-serif;
	font-size: 14px;
	margin-left: 301px;
	padding: 50px;
	max-width: 100%;
	height: 200px;
	min-height: 100%;
	background: dimgray;
}

.footer-content {
	max-width: 980px;
	margin: 0px auto 0px;
	color: lightgrey;
}

.footer-info {
	margin-right: 70px;
	width: 60%;
	float: left;
}

.footer-info p {
	margin-bottom: 30px;
}

.footer-nav {
	margin: 0;
	float:left;
}

.footer-list-nav {
	list-style-type: none;
	padding: 7px;
}

.footer-link {
	color: lightgrey;
	
}

.footer-link:hover {
	text-decoration: none;
	color: rgb(218, 165, 32);
	font-style: italic;
	font-weight: bold;
}

.footer-content:after {
	clear: left;
}

@media screen and (max-width: 1024px){
	body {
		font-size: 15px !important;
		min-width: 790px;
	}

	.contents-lectures {
		position: relative;
		width: 80%;
		margin: 50px 10% 0px;
		height: 100%;
		border: 1px solid #d5d2d0;
	}
	
	article {
		padding: 20px;
	}
		
	.text-position {
		padding: 20px;
	}

	.link-arrow {
		display: none;
	}
	
	.back_to_top {
		display: none;
	}

	article {
		padding: 20px;
	}

	.page-footer {
		margin: 0px;
	}
}

@media screen 
		and (min-device-width: 480px) 
		and (max-device-width: 1050px) {
	.point-first,.point-second {
		font-size: 20px !important;
		line-height: 40px;
	}
}

@media screen and (max-device-width: 480px ){
	body {
		font-size: 12px;
		line-height: 1.7em;
	}
	
	.menu .menu-point {
		font-size: 20px;
	}

	.code {
		font-size: 22px;
		line-height:2.5em;
	}

	article {
		padding: 20px;
	}
		
	.text-position {
		padding: 20px;
	}

	.contents-lectures {
		position: relative;
		width: 75%;
		margin: 50px 10%;
		padding: 30px;
		height: 100%;
	}
	
	.point-first,.point-second {
		font-size: 25px !important;
		line-height: 50px;
	}

	.link-arrow {
		display: none;
	}

	.back_to_top {
		display: none;
	}

	.page-footer {
		margin: 0px;
	}
}