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

body {
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	background: #edf1f4;
}

.dark {
	background: #282c2f;
}

.dark .calculator {
	background: #282c2f;
	box-shadow: 15px 15px 20px rgba(0, 0, 0, 0.25),
	-15px -15px 20px rgba(255, 255, 255, 0.1);
}

.dark .calculator .buttons #value {
	color: #eee;
	box-shadow: inset 15px 15px 20px rgba(0, 0, 0, 0.25),
	inset -15px -15px 20px rgba(255, 255, 255, 0.1);
}

.dark .calculator .buttons span {
	color: #eee;
	border: 2px solid #333;
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.25),
	-5px -5px 10px rgba(255, 255, 255, 0.1);
}

.dark .calculator .buttons span:active {
	box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.25),
	inset -5px -5px 10px rgba(255, 255, 255, 0.1);
}

.dark .calculator .buttons span#clear,
.dark .calculator .buttons span#plus,
.dark .calculator .buttons span#equal {
	border: 2px solid #333;
}

.dark .calculator .buttons span#clear:active,
.dark .calculator .buttons span#plus:active,
.dark .calculator .buttons span#equal:active {
	box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.1);
}

.dark .toggleBtn {
	background: #edf1f4;
	border: 2px solid #333;
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.25),
	-5px -5px 10px rgba(255, 255, 255, 0.25);
}

.calculator {
	position: relative;
	width: 340px;
	padding: 20px;
	border-radius: 20px;
	box-shadow: 15px 15px 20px rgba(0, 0, 0, 0.1), -15px -15px 20px #fffb;
}

.calculator .buttons {
	position: relative;
	display: grid;
}

.calculator .buttons #value {
	position: relative;
	grid-column: span 4;
	user-select: none;
	overflow: none;
	widows: 100px;
	text-align: end;
	color: #5166d6;
	height: 100px;
	line-height: 100px;
	box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.1),
	inset -5px -5px 20px #fff;
	border-radius: 10px;
	margin-bottom: 12px;
	padding: 0 20px;
	font-size: 2em;
	font-weight: 500;
}

.calculator .buttons span {
	position: relative;
	padding: 10px;
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
	-5px -5px 20px #fff;
	margin: 10px;
	cursor: pointer;
	user-select: none;
	min-width: 40px;
	display: flex;
	justify-content: center;
	align-items: center;
	font-size: 1.2em;
	color: #666;
	border: 2px solid #edf1f4;
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
	-5px -5px 10px #fff;
	border-radius: 10px;
}

.calculator .buttons span:active {
	box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.1),
	inset -5px -5px 10px #fff;
	color: #f44336;
}

.calculator .buttons span#clear {
	grid-column: span 2;
	background: #f44336;
	color: #fff;
	border: 2px solid #edf1f4;
}

.calculator .buttons span#plus {
	grid-row: span 2;
	background: #31a935;
	color: #fff;
	border: 2px solid#edf1f4;
}

.calculator .buttons span#equal {
	grid-row: span 2;
	background: #2196f3;
	color: #fff;
	border: 2px solid#edf1f4;
}

.calculator .buttons span#zero {
	grid-column: span 2;
}

.calculator .buttons span#clear:active,
.calculator .buttons span#plus:active,
.calculator .buttons span#equal:active {
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
	-5px -5px 10px #fff,
	inset 5px 5px 10px rgba(0, 0, 0, 0.1);
}

.toggleBtn {
	position: fixed;
	top: 20px;
	right: 20px;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	background: #555;
	cursor: pointer;
	border: 2px solid #edf1f4;
	box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
	-5px -5px 10px #fff;
}