daimon0482,
дивы уберите
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
form tr:hover input{ background-color: #FF00FF;}
</style>
</head>
<body>
<form>
<table>
<tr>
<td>
<input type="number" value="90">
</td>
<td>
<input type="number" value="88" >
</td>
<td>
<input type="number" value="44">
</td>
<td>
<input type="number" value="33">
</td>
</tr>
<tr>
<td>
<input type="number" value="54">
</td>
<td>
<input type="number" value="22" >
</td>
<td>
<input type="number"value="44">
</td>
<td>
<input type="number" value="33">
</td>
</tr>
</table>
</form>
</body>
</html>