*, *::before, *::after{
	box-sizing: border-box;
	font-family: 'Montserrat', sans-serif;
	font-weight: normal;
}

body{
	padding: 0;
	margin: 0;
	background: linear-gradient(to right, pink, blue);
}

.calculator-grid{
	display: grid;
	justify-content: center;
	align-content: center;
	min-height: 100vh;
	grid-template-columns: repeat(4, 80px);
	grid-template-rows: minmax(120px, auto) repeat(5, 60px);

}

.calculator-grid button{
	cursor: pointer;
	font-size: 2rem;
	border: 1px solid white;
	outline:none;
	background-color: rgb(255,255,255, .75);
}

.calculator-grid button:hover{
	background-color: rgb(255,255,255, .9);
}

.span-two{
	grid-column: span 2;

}

.output{
	grid-column: 1 / -1;
	background-color: rgba(0, 0, 0, .75);
	display: flex;
	align-items: flex-end;
	justify-content: space-around;
	flex-direction: column;
	padding: 10px;
	word-wrap: break-word;
	word-break: break-all;
}

.output .previous-operand{
	color: rgba(255, 255, 255, .75);
	font-size: 1.5rem;

}

.output .current-operand{
	color: white;
	font-size: 2.5rem;
	
}

@media(min-width: 800px){
	.calculator-grid{
		grid-template-columns: repeat(4, 180px);
        grid-template-rows: minmax(200px, auto) repeat(5, 200px);
	}
	
}
@media(max-width: 800px){
	.calculator-grid{
		grid-template-columns: repeat(4, 80px);
	    grid-template-rows: minmax(120px, auto) repeat(5, 60px);
	}
	
}