body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    text-align: center;
    padding: 100px 20px;
}

.spmm-container {
    background: #ffffff;
    padding: 40px;
    max-width: 600px;
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}