body{margin:0;font-family:Arial;background:#f4f6f9}
.header{background:#0d6efd;color:#fff;padding:12px}
.sidebar{width:220px;position:fixed;top:50px;bottom:0;background:#343a40}
.sidebar a{display:block;color:#fff;padding:10px;text-decoration:none}
.sidebar a:hover{background:#0d6efd}
.content{margin-left:220px;margin-top:50px;padding:20px}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{border:1px solid #ccc;padding:8px}
.btn{padding:6px 12px;background:#0d6efd;color:#fff;border:none}