* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f0f4f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.bank-container {
    background: #fff;
    padding: 25px;
    width: 350px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.balance-box {
    background: #e8f1ff;
    padding: 15px;
    text-align: center;
    border-radius: 8px;
}

.transaction-box {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

input {
    padding: 10px;
    font-size: 16px;
}

.buttons {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

button {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: none;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}

#depositBtn {
    background-color: #28a745;
}

#withdrawBtn {
    background-color: #dc3545;
}

#message {
    text-align: center;
    font-weight: bold;
}

/* 📱 Responsive Design */
@media (max-width: 480px) {
    .bank-container {
        width: 90%;
    }

    .buttons {
        flex-direction: column;
    }
}