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

body {
padding: 0;
margin: 0;
background: linear-gradient(to right, #00aaff, #00ff6c);
}

.calculator-grid {
/* margin-top: 175px; */
display: grid;
justify-content: center;
align-content: center;
min-height: 100vh;
grid-template-columns: repeat(4, 100px);
grid-template-rows: minmax(120px, auto) repeat(5, 100px);


}

.calculator-grid > button {
cursor: pointer;
font-size: 2rem;
border: 1px solid white;
outline: none;
background-color: rgba(255, 255, 255, 0.75);
}

.calculator-grid > button:hover {
background-color: rgba(255, 255, 255, 0.9);
}

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

.output {
grid-column: 1 / -1;
background-color: rgba(0, 0, 0, 0.75);
display: flex;
align-items: flex-end;
justify-content: space-between;
flex-direction: column;
padding: 10px;
word-wrap: break-word;
word-break: break-all;
}

.output .previous-operand {
color: rgba(255, 255, 255, 0.75);
font-size: 1.5rem;
}

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