/*@import url('https://fonts.googleapis.com/css?family=Roboto:300');*/
    
    *,
    *::before,
    *::after {
        box-sizing: border-box;
        font-family: 'Roboto', sans-serif;
        font-weight: normal;
    }
    
    body {
        margin: 0;
        padding: 0;
        background: linear-gradient(to right, #37db6e, #ffe604);
    }
    
    button {
        height: 80px;
    }
    
    .calculator-grid {
        display: grid;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        grid-template-columns: repeat(4, 80px);
        grid-template-rows: minmax(100px, auto) repeat(5, 80px);
    }
    
    .calculator-grid>button {
        cursor: pointer;
        font-size: 2rem;
        border: 1px solid white;
        outline: none;
        background-color: rgba(255, 255, 255, .70);
    }
    
    .calculator-grid>button:hover {
        background-color: rgba(255, 255, 255, .9);
    }
    
    .two-span {
        grid-column: span 2;
    }
    
    .output {
        grid-column: 1 / -1;
        background-color: rgba(0, 0, 0, .70);
        display: flex;
        align-items: flex-end;
        justify-content: space-around;
        flex-direction: column;
        padding: 10px;
        word-wrap: break-word;
        word-break: break-all;
        height: 100px;
        padding: 0;
    }
    
    .previous-output {
        color: rgba(255, 255, 255, .70);
        font-size: 1.5rem;
    }
    
    .current-output {
        color: rgba(255, 255, 255, 255);
        font-size: 2.5rem;
    }