body { margin: 0; font-family: Arial, sans-serif; background: #f4f4f4; }
.sidebar { width:200px; float:left; background:#333; color:white; height:100vh; padding:20px; }
.sidebar a { color:white; display:block; padding:10px; text-decoration:none; }
.content { margin-left:220px; padding:20px; }
button { padding:8px 12px; background:#2d89ef; color:white; border:none; border-radius:4px; }
.card { background:white; padding:10px; margin:5px 0; border-radius:4px; }