Problem with button size

Ionic Framework ionic-v3
1

Hello! I’m starting with HTML and I have a problem. I have a table and I would like that my buttons will be bigger. I tried with high and width but doesn’t work, somebody know how can I resolve it?
Thanks in advance.

Best regards.

<table width="100%" height="100%" border="1"> 
<tr> 
    <td align="center"><button > <ion-icon name="home"></ion-icon> </button></td> 
    <td align="center"><button > <ion-icon name="home"></ion-icon> </button></td>
</tr> 
<tr> 
    <td >3</td> 
    <td >4</td> 
</tr> 
<tr> 
    <td >5</td> 
    <td >6</td> 
</tr> 
</table>