*, *::before, *::after {
    box-sizing: border-box;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    font-weight: normal;
}

body {
    padding: 0px;
    margin: 0px;
    background: linear-gradient(rgb(36, 133, 146), rgb(25, 138, 25));
}

.calcGrid {
    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, 100px);
}

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

.calcGrid > 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-around;
    flex-direction: column;
    padding: 5px;
    min-height: 70px;
    word-wrap: break-word;
    word-break: break-all;
}

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

.output .currOperand {
    color: rgba(255, 255, 255, 1);
    font-size: 2.5rem;
}