.ptd-container {
    max-width: 600px;
    margin: 30px auto;
    padding: 20px;
    background: #f8f8f8;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 0 8px rgba(0,0,0,0.1);
}

.ptd-container input,
.ptd-container button {
    margin-top: 10px;
    padding: 10px;
    font-size: 16px;
}