body { margin:0; font-family:sans-serif; }
#tabs { display:flex; background:#1e1e1e; padding:5px; }
.tab { padding:6px 10px; background:#444; color:white; margin-right:5px; border-radius:5px 5px 0 0; cursor:pointer; }
.tab.active { background:white; color:black; }
.tab button { margin-left:5px; border:none; background:none; color:red; cursor:pointer; }
#controls { background:#eee; padding:5px; }
#view { padding:10px; border-top:1px solid #ccc; min-height:500px; }