You can simply do something like this in your CSS, using border-spacing and padding:
table {
border-collapse: collapse;
}
td, th {
padding: 1em;
border: 1px solid blue;
}<table>
<tr>
<th>head_1</th>
<th>head_2</th>
<th>head_3</th>
<th>head_4</th>
</tr>
<tr>
<td>txt_1</td>
<td>txt_2</td>
<td>txt_3</td>
<td>txt_4</td>
</tr>
</table>