body{font-family:Arial,sans-serif;line-height:1.6;color:#333}.container{max-width:600px;margin:0 auto;padding:20px}.header{background:#4a90e2;color:#fff;padding:20px;text-align:center;border-radius:8px 8px 0 0}.content{background:#f8f9fa;padding:30px;border-radius:0 0 8px 8px}.details-box{background:#fff;padding:20px;border-radius:8px;margin:20px 0;border:1px solid #e1e8ed}.footer{text-align:center;padding:20px;color:#7f8c8d;font-size:12px}