.sem-form{max-width:720px;margin:18px auto;padding:18px;border:1px solid #e6e6e6;background:#fff;border-radius:8px;}
.sem-upi{background:#f7f7f7;padding:8px;border-radius:4px;margin-bottom:12px;}
.sem-success{background:#d4edda;padding:10px;border:1px solid #c3e6cb;margin-bottom:12px;}
canvas#sem-sign{border:1px solid #ccc;border-radius:4px;display:block;margin-bottom:8px;}