.display {
    font-size: 1rem;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background-color: #f8f9fa;
    text-align: right;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.buttons .btn {
    font-size: 1.5rem;
    margin: 2px;
}

.conversion {
    margin-top: 2rem;
}