I'm working on an email where there's a table of content (with a blue background), followed by a row with an image. On Android 7, there's a white line appearing above my image (I think it's adding a border around my image) - does anyone know how to resolve this?

I've tried adding that image inside the table with the content and that fixes the issue (well, maybe doesn't "fix" it, but hides that issue as the background is then blue too) - but then it causes an issue in Android 5 - where it puts blue lines either side of the table where this image is.

Here is the code for the 2 rows I'm talking about:

<tr>
<td align="center">
<table width="600" cellpadding="0" cellspacing="0" border="0" align="center" class="fullwidth" bgcolor="#001b47" style="width:600px;">
<tr>
<td height="32" class="td20"></td>
</tr>
<tr>
<td align="center">
<table width="510" cellpadding="0" cellspacing="0" border="0" align="center" class="width90pc" style="width:510px;">
<tr>
<th width="286" class="fullwidth displayblock" align="center" valign="top" style="width:286px;">
<table width="100%" cellpadding="0" cellspacing="0" border="0" align="center">
<tr>
<td height="20"></td>
</tr>
<tr>
<td class="textcenter" style="font-family: 'Gotham SSm A', 'Gotham SSm B', Arial, Helvetica, sans-serif; font-size:23px; line-height:30px; color:#ffffff; text-align:left; font-weight:700;">
Some Text to go here
</td>
</tr>
<tr>
<td height="20"></td>
</tr>
</table>
</th>
<th width="224" class="fullwidth displayblock" align="center" valign="top" style="width:244px;">
<img src="http://via.placeholder.com/224x232" width="224" height="232" style="display:block;" border="0" alt="" class="imgfull" />
</th>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="center">
<table width="600" cellpadding="0" cellspacing="0" border="0" align="center" class="fullwidth" style="width:600px; border-collapse:collapse;">
<tr>
<td style="font-size:1px; line-height:1px; -mso-line-height:1px; border-collapse:collapse; border:0px;">
<img src="http://via.placeholder.com/600x89" width="600" height="89" style="display:block; border-style: none; font-size:1px; line-height:1px; -mso-line-height:1px;" border="0" alt="" class="imgfull" />
</td>
</tr>

</table>
</td>
</tr>


 Thank you in advance! :)