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HTML 

              
                <div class="container">
	<div class="d-flex vh-100">
		<div class="the-calculator col-md-6 m-auto bg-secondary border border-secondary rounded">
		<div class="output bg-dark mt-3 w-100 border border-secondary rounded text-light text-right"></div>
		<div class="buttons container-fluid bg-light mt-3 pt-3">
			<div class="row mt-3">
				<div class="col-3"></div>
				<div class="col-3"></div>
				<div class="col-3"><span class="btn btn-danger btn-of-calc cee text-light">C</span></div>
				<div class="col-3"><span class="btn btn-warning btn-of-calc symbol text-light">/</span></div>
			</div>
			<div class="row mt-3">
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">7</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">8</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">9</span></div>
				<div class="col-3"><span class="btn btn-danger btn-of-calc symbol text-light">-</span></div>
			</div>
			<div class="row mt-3">
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">4</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">5</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">6</span></div>
				<div class="col-3"><span class="btn btn-primary btn-of-calc symbol text-light">*</span></div>
			</div>
			<div class="row mt-3">
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">1</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">2</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">3</span></div>
				<div class="col-3"><span class="btn btn-success btn-of-calc symbol text-light">+</span></div>
			</div>
			<div class="row mt-3">
				<div class="col-3"><span class="btn btn-dark btn-of-calc nums text-light">0</span></div>
				<div class="col-3"><span class="btn btn-dark btn-of-calc dot text-light">.</span></div>
				<div class="col-3"><span class="btn btn-info btn-of-calc result text-light">=</span></div>
				<div class="col-3"></div>
				<div class="col-3"></div>
			</div>
		</div>
		<div class="text-center mt-3">
		<h4 class="text-success">Dev. By: Nadeem Gorsi</h4>
	</div>

	</div>
	</div>
	
</div>
!

CSS 

              
                * {
	font-family: "Gugi", cursive;
}

.the-calculator {
	height: 510px;
	background: url(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRTBGDiNePr5ItqZ3LY_3FgC6qIVQYhQDlXF3lg4eb6ozFi156ApQ);
	box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
}

.output {
	height: 80px;
}

.buttons {
	height: 75%;
}

.btn-of-calc {
	width: 100%;
	height: 48px;
	line-height: 48px;
	padding: 0;
	font-size: 25px;
	font-weight: bold;
	box-shadow: 0px 17px 10px -10px rgba(0, 0, 0, 0.4);
}

.btn-of-calc:active {
	box-shadow: none;
}

.output {
	font-size: 45px;
	padding-right: 8px;
}
.vh-100 {
	height: 100vh;
}
!

JS 

              
                //build a calculator...
var operators = [".", "+", "*", "-", "/"];
$(".cee").click(function() {
	//clear and reset everything...
	$(".output").html("");
});
$(".nums").click(function() {
	$(".output").html($(".output").html() + "" + $(this).html());
});
$(".dot").click(function() {
	if (
		$(".output")
			.html()
			.indexOf(".") === -1
	) {
		$(".output").html($(".output").html() + "" + $(this).html());
	}
});
$(".symbol").click(function() {
	if (
		!operators.includes(
			$(".output")
				.html()
				.charAt($(".output").html().length - 1)
		)
	) {
		$(".output").html($(".output").html() + "" + $(this).html());
	}
});
$(".result").click(function() {
	if (
		$(".output")
			.html()
			.indexOf(".") === -1
	) {
		$(".output").html(eval($(".output").html()));
	} else {
		$(".output").html(eval($(".output").html()).toFixed(2));
	}
});
!
999px

Console