body{font-family:Arial,sans-serif;display:flex;flex-direction:column;align-items:center;margin:0;padding:0;background-color:#f8f9fa}h1{margin-top:20px}table{margin:10px auto;border-collapse:collapse;width:50%;height:40%}table,td,th{border:2px solid #fbc5e3}td,th{padding:10px;width:10%}td{cursor:pointer}td:hover{background-color:#f0f0f0}#comparison-exercises,#equality-exercises,#mental-exercises{display:flex;flex-direction:column;gap:10px;margin:20px 0;padding:10px;border:1px solid #ccc;background-color:#fff}.exercise{display:flex;align-items:center;gap:10px}.exercise input{width:50px;padding:5px;font-size:1em;text-align:center;border:1px solid #ccc;border-radius:5px;box-sizing:border-box}#comparison-controls,#equality-controls,#mental-controls{display:flex;flex-direction:row;gap:10px;margin-top:20px}#comparison-controls button,#equality-controls button,#mental-controls button{padding:10px 20px;cursor:pointer;border:none;background-color:#007bff;color:#fff;font-size:1em;border-radius:5px}#comparison-controls button:hover,#equality-controls button:hover,#mental-controls button:hover{background-color:#0056b3}.correct{background-color:#90ee90}.incorrect{background-color:#f08080;color:#fff}.correct-answer{font-size:.8em;color:#555}.vertical_part{background-color:#c9f2f7}