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HTML

              
                <main ontouchstart class="calculator pre-enter">
	<section class="screen">
		<div class="equation">
			<div class="summary"></div>
			<div class="total">0</div>
		</div>
	</section>
	<section class="buttons">
		<div class="numbers">
			<ul>
				<li class="clear">
					<button data-val="clear">c</button>
				</li>
				<li>
					<button data-val="9">9</button>
				</li>
				<li>
					<button data-val="8">8</button>
				</li>
				<li>
					<button data-val="7">7</button>
				</li>
				<li>
					<button data-val="6">6</button>
				</li>
				<li>
					<button data-val="5">5</button>
				</li>
				<li>
					<button data-val="4">4</button>
				</li>
				<li>
					<button data-val="3">3</button>
				</li>
				<li>
					<button data-val="2">2</button>
				</li>
				<li>
					<button data-val="1">1</button>
				</li>
				<li class="zero">
					<button data-val="0">0</button>
				</li>
				<li>
					<button data-val=".">.</button>
				</li>
			</ul>
		</div>
		<div class="operators">
			<ul>
				<li>
					<button data-val="÷">÷</button>
				</li>
				<li>
					<button data-val="×">×</button>
				</li>
				<li>
					<button data-val="-">-</button>
				</li>
				<li>
					<button data-val="+">+</button>
				</li>
				<li>
					<button data-val="=">=</button>
				</li>
			</ul>
		</div>
	</section>
</main>
              
            
!

CSS

              
                $teal: #07F7BF;
$green: #B4ED50;
$yellow: #f4d063;
$orange: #fc9d6b;
$grey: #333;

$border: mix(mix($teal, $green), $grey, 80%);
$font: "brandon-grotesque", "Brandon Grotesque", "Source Sans Pro", "Segoe UI", Frutiger, "Frutiger Linotype", "Dejavu Sans", "Helvetica Neue", Arial, sans-serif;
$padding: 12px;

$easeOutCubic: cubic-bezier(0.215, 0.610, 0.355, 1.000);

* { box-sizing: border-box; user-select: none; -webkit-tap-highlight-color: rgba(0,0,0,0); }
*:focus { outline: none!important; }
body, html { height: 100vh; }
body {
	display: flex;
	align-items: flex-start;
	align-content: flex-start;
	justify-content: center;
	perspective: 1000px;
	margin: 0;
	padding: $padding;
	font-family: $font;
	color: white;
	text-rendering: optimizeLegibility;
	-webkit-font-smoothing: antialiased;
	background: $green;
	background: linear-gradient(135deg, rgba($green, 1) 0%, rgba($teal, 1) 100%);
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='$green', endColorstr='$teal',GradientType=1 );
}

.calculator {
	display: flex;
	flex-flow: row wrap;
	width: 259px;
	box-shadow: 0 0 10px rgba(#555, .2);
	border-radius: $padding;
	&.pre-enter {
		opacity: 0;
		transform: rotateX(30deg) rotateY(30deg) translateY(300px) translateZ(0);
		visibility: hidden;
		.total {
			opacity: 0;
		}
	}
	&.on-enter {
		opacity: 1;
		transform: none;
		visibility: visible;
		transition: all 1000ms $easeOutCubic;
		.total {
			opacity: 1;
			transition: opacity 300ms ease-out 1000ms;
		}
	}
	button {
		display: block;
		padding: 0;
		border: 0;
		width: 64px;
		height: 64px;
		background: none;
		font-family: $font;
		cursor: pointer;
		transition: all 200ms ease-out;
		&:active, &.active {
			transition: all 100ms ease-in;
		}
	}
	.screen {
		width: 100%;
		border-bottom: 1px solid $border;
	}
	.equation {
		width: 100%;
		padding: $padding/2;
		border-radius: $padding $padding 0 0;
		background: white;
		color: $grey;
		overflow: hidden;
		.summary, .total {
			display: flex;
			justify-content: flex-end;
		}
	}
	.summary {
		padding: $padding/2 $padding/2 0;
		height: 22px;
		font-size: 16px;
		font-weight: 500;
		color: lighten($grey, 50%);
	}
	.total {
		padding: $padding/4 $padding/2 $padding/2;
		font-size: 32px;
	}
	.buttons {
		display: flex;
	}
	.numbers {
		width: 194px;
		ul {
			display: flex;
			flex-flow: row wrap;
			background: rgba(white, .3);
			border-bottom-left-radius: $padding;
		}
		button {
			font-size: 24px;
			font-weight: 400;
			color: $grey;
			background: rgba(white, .5);
			&:hover, &:focus {
				background: rgba(white, .75);
			}
			&:active, &.active {
				background: rgba($grey, .05);
			}
		}
		li {
			border-bottom: 1px solid $border;
			border-left: 1px solid $border;
			&.zero, &:last-child {
				border-bottom: 0;
			}
			&.clear, &:nth-child(2), &:nth-child(5), &:nth-child(8), &.zero {
				border-left: 0;
			}
		}
		.clear {
			width: 100%;
			button {
				width: 100%;
				background: rgba(white, .25);
				&:hover, &:focus {
					background: rgba(white, .75);
				}
				&:active, &.active {
					background: rgba($grey, .05);
				}
			}
		}
		.zero {
			width: 129px;
			button {
				width: 100%;
				border-bottom-left-radius: $padding;
			}
		}
	}
	.operators {
		width: 65px;
		border-left: 1px solid $border;
		ul {
			background: $yellow;
			background: linear-gradient(to bottom, rgba($yellow,1) 0%,rgba($orange,1) 100%);
			filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='$yellow', endColorstr='$orange',GradientType=0 );
			border-bottom-right-radius: $padding;
		}
		button {
			font-size: 36px;
			font-weight: 300;
			color: white;
			&:hover, &:focus {
				background: rgba(saturate(lighten(mix($orange, $yellow), 25%), 15%), .25);
			}
			&:active, &.active {
				background: rgba(saturate(darken(mix($orange, $yellow), 25%), 15%), .25);
			}
		}
		li {
			&:last-child {
				button {
					border-bottom-right-radius: $padding;
				}
			}
			&:not(:last-child) {
				border-bottom: 1px solid $border;
			}
		}
	}
}

@media only screen and (min-height: 424px) {
	body {
		align-items: center;
		align-content: center;
		overflow: hidden;
	}
}
              
            
!

JS

              
                // on enter
$(".calculator").addClass("pre-enter");
setTimeout(function(){
	$(".calculator").addClass("on-enter");
}, 500);
setTimeout(function(){
	$(".calculator").removeClass("pre-enter on-enter");
}, 2000);

// calculator
// heavily modified from @supah's calculator
// https://codepen.io/supah/pen/pgGYBe
var $keys = $('button');
var $total = $('.total');
var $summary = $('.summary');
var decimal = false;
var operators = ['+', '-', '×', '÷'];

$keys.click(function() {
	var keyVal = $(this).data('val');
	output = $summary.html();
	var lastChar = output[output.length - 1];

	// clear
	if (keyVal == 'clear') {
		$total.html('0');
		$summary.html('');
		decimal = false;
	}

	// equal
	else if (keyVal == '=') {
		output = output.replace(/×/g, '*').replace(/÷/g, '/');
		if (operators.indexOf(lastChar) > -1 || lastChar == '.')
			output = output.replace(/.$/, '');
		if (output) {
			$total.html(Math.round(eval(output)*10000000)/10000000);
		}
		$summary.addClass("complete");
		decimal = false;
	}

	// operators
	else if ($(this).parent().parent().parent().is('.operators')) {
		if ($summary.is(".complete")) {
			$summary.removeClass("complete");
		}
		if (output != '' && operators.indexOf(lastChar) == -1) {
			$summary.html($summary.html() + keyVal);
		} else if (output == '' && keyVal == '-') {
			$summary.html($summary.html() + keyVal);
		}
		if (operators.indexOf(lastChar) > -1 && output.length > 1) {
			$summary.html($summary.html().replace(/.$/, keyVal));
		}
		decimal = false;
	}

	// decimal
	else if (keyVal == '.') {
		if ($summary.is(".complete")) {
			$summary.html('0' + keyVal);
			$summary.removeClass("complete");
		} else if (output == '') {
			$summary.html('0' + keyVal);
		} else if (operators.indexOf(lastChar) > -1) {
			$summary.html($summary.html() + '0' + keyVal);
		} else {
			if (!decimal) {
				$summary.html($summary.html() + keyVal);
				decimal = true;
			}
		}
	}

	// numerals
	else {
		if ($summary.is(".complete")) {
			$summary.html(keyVal);
			$summary.removeClass("complete");
		} else {
			$summary.html($summary.html() + keyVal);
		}
	}
})

$(window).keydown(function(e) {
	console.log(e.which);
	switch (e.which) {
		case 48:
			key = 0;
			break;
		case 49:
			key = 1;
			break;
		case 50:
			key = 2;
			break;
		case 51:
			key = 3;
			break;
		case 52:
			key = 4;
			break;
		case 53:
			key = 5;
			break;
		case 54:
			key = 6;
			break;
		case 55:
			key = 7;
			break;
		case 56:
			key = 8;
			break;
		case 57:
			key = 9;
			break;
		
		case 191:
			key = '÷';
			break;
		case 190:
			key = '.';
			break;
		case 88:
			key = '×';
			break;
		case 189:
			key = '-';
			break;
		case 187:
			key = '+';
			break;
		case 67:
			key = 'clear';
			break;
		
		case 96:
			key = 0;
			break;
		case 97:
			key = 1;
			break;
		case 98:
			key = 2;
			break;
		case 99:
			key = 3;
			break;
		case 100:
			key = 4;
			break;
		case 101:
			key = 5;
			break;
		case 102:
			key = 6;
			break;
		case 103:
			key = 7;
			break;
		case 104:
			key = 8;
			break;
		case 105:
			key = 9;
			break;
		
		case 111:
			key = '÷';
			break;
		case 109:
			key = '-';
			break;
		case 106:
			key = '×';
			break;
		case 107:
			key = '+';
			break;
		case 13:
			key = '=';
			break;
		case 110:
			key = '.';
			break;
		case 27:
			key = 'clear';
			break;
		default:
			return false;
						}
	$('[data-val="' + key + '"]').addClass('active').click();
}).keyup(function(){
	$('.active').removeClass('active');
});
              
            
!
999px

Console