Horizontal Alignment on iOS Mail App

I'm building an email that has a "Learn More" button image in it. Ideally, the button would be centered in the email content. To display it this way, I've selected the 3-column layout row, kept the left and right cells blank, and placed my button image in the center cell.For styling of this cell, I chose padding: 25, horizontal: center, and vertical: top. 



This works perfectly in Hotmail/Outlook.com, Yahoo, Gmail, and MS Outlook. But the image shows up aligned to the left on the stock iOS mail app. Because there are so many recipients who view their emails on mobile now, this is less than ideal.



I've tried to create the same effect using the 1-column row, choosing padding: 10px, horizontal: center, and vertical: top. That yielded the same result -- left-aligned image.



It's my understanding that using the code: <td style="text-align: center;"> would solve this problem.



Has anyone discovered a solution to this? Without access to the code, I'm stuck using the editor that doesn't offer the ability to change this myself.