css padding is not working in outlook

I have following html in email template.

I am getting different view in MS Outlook and in gmail for the same.

<tr>
    <td bgcolor="#7d9aaa" style="color: #fff; font-size:15px; font-family:Arial, Helvetica, sans-serif; padding: 12px 2px 12px 0px; ">
    <span style="font-weight: bold;padding-right:150px;padding-left: 35px;">Order Confirmation </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    <span style="font-weight: bold;width:400px;"> Your Confirmation number is {{var order.increment_id}} </span></td>
</tr>

How to fix this?