#calculator-app {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    background: #f4f4f4;
    border: 1px solid #ddd;
    border-radius: 5px;
    color: black;
}

#calculator-display {
    width: 100%;
    padding: 10px;
    font-size: 20px;
    margin-bottom: 10px;
    text-align: right;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
}

.calculator-buttons button {
    padding: 15px;
    font-size: 18px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 5px;
    cursor: pointer;
    color: black !important;
}

.calculator-buttons button:hover {
    background: #eee;
}