body{font-family:Arial,sans-serif;background:#0a0f1e;color:#fff;padding:30px;text-align:center}h1{color:#f44336}.bet-controls{margin-bottom:20px}input[type=number]{font-size:16px;padding:8px;width:160px;margin-right:10px;border-radius:5px;border:none}button{font-size:16px;padding:8px 14px;margin:5px;background-color:#333;color:#fff;border:none;border-radius:5px;cursor:pointer}.sky{position:relative;width:100%;max-width:600px;height:220px;margin:20px auto;background:linear-gradient(to top,#1b2735,#090a0f);border:2px solid #444;border-radius:10px;overflow:hidden}.grid-lines:before{content:"";position:absolute;width:100%;height:100%;background-image:linear-gradient(to right,rgba(255,255,255,.1) 1px,transparent 1px),linear-gradient(to bottom,rgba(255,255,255,.1) 1px,transparent 1px);background-size:60px 40px;z-index:0}#plane{font-size:40px;position:absolute;top:50%;left:0;transform:translateY(-50%);z-index:2;transition:left .05s linear}#multiplier{font-size:28px;margin-top:20px;color:#0f0}#result{margin-top:20px;font-size:18px}#balance{margin-top:10px;font-size:18px;color:gold}#historyList{list-style-type:none;padding:0;margin-top:10px;max-height:120px;overflow-y:auto;text-align:left;width:fit-content;margin-left:auto;margin-right:auto}#historyList li{padding:4px;border-bottom:1px solid #444;font-size:15px}