body {

    background: #f5f7fa;
    margin: 0;

}
.calculator-container {
    max-width: 900px;
    margin: auto;
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}
/* Additional styles omitted for brevity */