body {
    font-family: 'TH Sarabun New', sans-serif;
    background-color: #f0f8ff;
    text-align: center;
    padding: 40px;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    max-width: 500px;
    margin: auto;
}
button {
    padding: 10px 20px;
    font-size: 18px;
}