Атрибут cellspacing

<table cellspacing='число'>...</table>

<!DOCTYPE html>
<html lang='ru'>
<head>
<meta charset='UTF-8'>
<meta name='viewport' content='width=device-width, initial-scale=1.0'>
<title>Document</title>
</head>
<body>
<table cellspacing='10' border='1'>
<tr>
<td>Смартфон</td>
<td>Ноутбук</td>
<td>Телевизор</td>
</tr>
<tr>
<td>15.000 ₽</td>
<td>100.000 ₽</td>
<td>45.000 ₽</td>
</tr>
</table>
</body>
</html>