style.css

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

body {
     padding: 0;
     margin: 0;
     background: linear-gradient(to right, #c44bb0, #3122749a);
}

.calculator-grid {
    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 rgba(99, 93, 96, 0.397);
    outline:none;
    background-color: rgba(182, 180, 167, 0.5) ;
}

.calculator-grid > button:hover {
    background-color:rgba(175, 102, 235, 0.9);
}

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

.equal-button {
    grid-column: span 2;
    border-bottom-right-radius: 25px;
}

.dot {
    border-bottom-left-radius: 25px;
}

.output{

    grid-column: 1/-1;
    background-color: rgba(104, 117, 153, 0.582);
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    flex-direction: column;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;
    border-top-left-radius: 25px;
    border-top-right-radius: 25px;
    
    
}

.output .previous-operand {
    color: rgba(255, 244, 244, 0.658);
    font-size: 2rem;
}

.output .current-operand {
    color: rgba(255, 255, 255, 0.918);
    font-size: 3rem;
    
}