Form Hitung (bagian body) Part 1

	<div class="container">
		<div class="card">
    		<div class="card-header">
    				<h1>Menghitung Luas Persegi Panjang</h1>
    		</div>
    		<div class="card-body">
    			<div class="row">
    			<div class="col-md-4 col-sm-12">
    				<form action="./" method="post" enctype="multipart/form-data">
    				<div class="form-group">
    					<label>Panjang :</label>
    						<input type="text" name="panjang" class="form-control">
    				</div>
    				<div class="form-group">
    					<label>Lebar :</label>
    						<input type="text" name="lebar" class="form-control">
    				</div>
    				<div class="form-group">
    					<button type="submit" name="hitung" class="btn btn-success">Hitung</button>
    				</div>
    				</form>
    			</div>

    			<div class="col-md-4 col-sm-12">
    			</div>

    			<div class="col-md-4 col-sm-12">
    				<div class="form-group">
    					<label>Luas :</label>
    						<input type="text" name="luas" class="form-control" disabled>
    				</div>
    			</div>
    			</div>
    		</div>
  		</div>
	</div>