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HTML

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                .wrap
	.app
		img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744913/statusBar_ul1ods.svg", alt="status bar").statusBar
		header
			.notifHeader
				.userAvatar
					img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744914/userAvatar_c6ayqe.jpg", alt="")
				.options
					i.fa.fa-search
					i.fa.fa-bell
			.timeStamp
				.greet
					p Good Morning
					h1 Praveen
				.dayIcon
					i.fa.fa-sun-o
		.reminders
			.halfWidth
				.todo
					i.fa.fa-book
					span 4
					p Classes today
					.line
					h4 VIEW
				.todo
					i.fa.fa-files-o
					span 2
					p Assignments due
					.line
					h4 VIEW
			.fullWidth
				.todo
					i.fa.fa-clock-o
					span 6
					p To do items
					.line
					h4 VIEW
		.publicActivity
			.card
				.userAvatar
					img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744912/adelle_vrgiyu.jpg", alt="")
				p.userName Adelle
				h1.text Created Physics <br> study group
				.line
				.action
					.activityIcon
						i.fa.fa-plus-circle
					span JOIN
			.card
				.userAvatar
					img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744913/james_p06w6j.jpg", alt="")
				p.userName James
				h1.text Started a thread <br> on Physics 
				.line
				.action
					.activityIcon
						i.fa.fa-comment
					span COMMENT
		.friends
			p.title Friends recommendations
			.card
				.cardCol
					.userAvatar
						img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744911/1_jwmd87.jpg", alt="")
					p.userName David
					span JOIN
					p.activity Joined Mathematics class
				.cardCol
					.userAvatar
						img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744911/2_sujm9p.jpg", alt="")
					p.userName Alexander
					span JOIN
					p.activity Created a chemistry final exam group
				.cardCol
					.userAvatar
						img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744912/3_om9a9v.jpg", alt="")
					p.userName Rajiv
					span JOIN
					p.activity Joined Physics class
				.cardCol
					.userAvatar
						img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744911/4_neb0gp.jpg", alt="")
					p.userName Christian
					span JOIN
					p.activity Created a personality development class
		.empty
	.tabs
		.tab
			img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744912/feed_fmytit.svg")
		.tab
			img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744911/cal_cexot2.svg")
		.tab
			img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744913/msg_owdthq.svg")
		.tab
			img(src="https://res.cloudinary.com/prvnbist/image/upload/v1512744914/user_xszplu.svg")
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700');

@mixin object($width, $height, $bg) {
	width: $width;
	height: $height;
	background: $bg;
}

@mixin transPos($top, $right, $bottom, $left,$transX,$transY) {
	position: absolute;
	top: $top;
	left: $left;
	right: $right;
	bottom: $bottom;
	transform:translate($transX,$transY);
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}


body {
	height:100vh;
	display: flex;
	justify-content:center;
	align-items:center;
}

::-webkit-scrollbar{
	display: none;
}


.wrap {
	@include object(375px,640px,#0D1019);
	font-family: "Open Sans", sans-serif;
	position: relative;
	overflow: hidden;
	.app {
		@include object(375px,640px,null);
		overflow-y: scroll;
		.statusBar {
			position: fixed;
			z-index: 10;
		}
		header {
			padding:25px 16px 0 16px;
			.notifHeader {
				height:50px;
				display: flex;
				align-items: center;
				justify-content: space-between;
				.userAvatar {
					@include object(35px,35px,null);
					img{
						border-radius:50%;
						width:100%;
						cursor:pointer;
					}
				}
				.options {
					text-align: right;
					i {
						width:50px;
						color:#fff;
						cursor:pointer;
					}
				}
			}
			.timeStamp{
				display: flex;
				justify-content: space-between;
				margin: 20px 0;
				.greet {
					color:#fff;
					p {					
						font-size: 16px;
						margin-bottom: 10px;
						letter-spacing: 0.5px;
					}
					h1 {
						font-size: 40px;
						font-weight: 500;
					}
				}
				.dayIcon {
					@include object(52px,52px,null);
					i {
						font-size: 60px;
						margin-left: -5px;
						color:yellow;
					}
				}
			}
		}
		.reminders {
			padding:0 16px;
			color:#fff;
			
			.halfWidth {
				display: flex;
				justify-content: space-between;
				.todo {
					@include object(48%,160px,null);
					border-radius:10px;
					position: relative;
					span {
						font-size: 72px;
						font-weight: 300;
						margin: 0 16px;
						line-height: 90px;
					}
					.fa {
						@include transPos(20px,20px,null,null,null,null);
					}
					p,h4 {
						padding-left: 16px;
					}
					.line {
						height: 2px;
						margin-top: 10px;
						background: rgba(#fff, 0.3);
					}
					h4 {
						font-weight: 600;
						line-height: 40px;
						cursor:pointer;
					}
					&:first-child {
						background: #FACE14;
					}
					&:last-child {
						background: #F21E60;
					}
				}
			}
			.fullWidth {
				.todo {
					@include object(100%,160px,#8D4DE9);
					border-radius:10px;
					margin-top: 15px;
					position: relative;
					span {
						font-size: 72px;
						font-weight: 300;
						margin: 0 16px;
						line-height: 116px;
						float:left;
					}
					.fa {
						@include transPos(20px,20px,null,null,null,null);
					}
					p {
						padding-top:72px; 
					}
					.line {
						height: 2px;
						margin-top: 10px;
						background: rgba(#fff, 0.3);
						clear:both;
					}
					h4 {
						font-weight: 600;
						padding-left:16px; 
						line-height: 40px;
						cursor:pointer;
					}
				}
			}
		}
		.publicActivity {
			@include object(600px,auto,#1E1F27);
			margin: 16px 0;
			padding: 16px 0 16px 16px;
			overflow-x: auto;
			white-space: nowrap;
			display: flex;
			.card{
				@include object(240px,160px,#fff);
				float:left;
				border-radius: 10px;
				&:first-child {
					margin-right: 16px;
				}
				.userAvatar{
					@include object(32px,32px,null);
					margin: 16px;
					margin-bottom: 10px;
					float:left;
					img {
						width:100%;
						border-radius:50%;
						cursor:pointer;
					}
				}
				.userName{
					margin-top: 25px;
					font-weight: 600;
					font-size: 14px;
						cursor:pointer;
				}
				.text{
					clear:both;
					line-height: 24px;
					margin: 0 16px;
					font-size: 20px;
				}
				.line {
					height: 2px;
					margin-top: 10px;
					background: rgba(0, 0, 0, 0.1);
				}
				.action{
					.activityIcon{
						@include object(42px,42px,null);
						text-align: center;
						float:left;
						i {
							line-height: 42px;
							color:#99cc66;
							cursor:pointer;
						}
					}
					span{
						color:#99cc66;
						font-weight: 600;
						font-size: 14px;
						cursor:pointer;
						line-height: 42px;
					}
				}
			}
		}
		.friends{
			@include object(100%,300px,null);
			padding:0 16px;
			margin: 16px 0;
			.title {
				font-size:14px;
				color: rgba(#fff,0.4);
			}
			.card {
				@include object(100%,422px,#fff);
				border-radius:10px;
				margin-top: 16px;
				.cardCol {
					height:auto;
					border-bottom: 2px solid rgba(#000,0.1);
					&:last-child {
						border-bottom: none;
					}
					.userAvatar {
						@include object(30px,30px,null);
						float:left;
						margin: 16px 16px 5px 16px;
						img{
							width:100%;
							border-radius:50%;
							cursor:pointer;
						}
					}
					.userName{
						padding-top: 26px;
						font-weight: 600;
						font-size: 14px;
					}
					span{
						float:right;
						margin: -15px 15px 0 0;
						font-size:14px;
						cursor:pointer;
						color:#99cc66;
						font-weight: 600;
					}
					.activity{
						line-height: 24px;
						margin: 0 16px;
						font-size: 18px;
						clear:both;
						padding-bottom: 16px;
						opacity: 0.7;
					}
				}
			}
		}
		.empty {
			@include object(100%,216px,null);
		}
	}
	.tabs {
		@include object(100%,60px,#161724);
		@include transPos(null,null,0,0,null,null);
		display: flex;
		justify-content: space-between;
		.tab {
			width:25%;
			text-align: center;
			line-height: 70px;
			cursor:pointer;
			transition:0.4s ease-in-out;
			&:first-child {
				background: darken(#161724,5%);
			}
			&:hover  {
				background: darken(#161724,5%);
			}
		}
	}
}

@media screen and(max-width:380px) {
	.wrap {
		@include object(100vw,100vh,#0D1019);
		.app {
			width:inherit;
			height:inherit;
			overflow-x:hidden;
		}
	}
}
!

JS 

              
                //credit - https://dribbble.com/shots/3148660-Student-Dashboard
!
999px

Console