#ht-tetris{width:300px;margin:0 auto;position:relative;text-align:center;}
#ht-start{margin-bottom:10px;padding:8px 16px;font-size:1rem;}
#ht-canvas{background:#f9f9f9;display:block;margin:0 auto;}
#ht-controls{display:flex;justify-content:space-around;margin:5px 0;}
#ht-controls button{flex:1;margin:0 5px;padding:8px;font-size:1.2rem;background:#ddd;border:none;border-radius:4px;}
#ht-score{text-align:right;font-family:Arial;margin-bottom:10px;}
#ht-over{text-align:center;font-family:Arial;}
#ht-board{list-style:none;padding:0;width:300px;margin:10px auto;}
#ht-board li{background:#eee;margin:3px 0;padding:5px;border-radius:4px;font-family:Arial;}