#f1-reflex-app { text-align:center; font-family:Arial, sans-serif; margin:20px auto; }
.lights { display:flex; justify-content:center; gap:10px; margin:20px; }
.light { width:40px; height:40px; border-radius:50%; background:#333; border:2px solid #111; }
.light.on { background:red; }
#message { margin-top:20px; font-size:18px; }
#reactionTime { margin-top:10px; font-weight:bold; font-size:20px; }
#startButton, #saveButton { padding:10px 20px; font-size:16px; cursor:pointer; margin-top:10px; }
#leaderboard { text-align:left; display:inline-block; margin-top:20px; }
#playerName { padding:8px; font-size:16px; margin-right:5px; }