body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 20px;
}

.chat-box {
    background: #f8f9fa;
    padding: 10px;
    border-radius: 5px;
}

.message {
    padding: 8px;
    border-radius: 8px;
    margin-bottom: 5px;
}

.sent {
    background: #007bff;
    color: white;
    text-align: right;
}

.received {
    background: #e9ecef;
    text-align: left;
}