Changes
<td style="width:100%;padding:0px;margin:0px">
<!-- GUIDELINE -->
<table style="width:100%;background-color:#dbdbe4;border:1px solid lightgreygrey;padding:0px;margin:0px">
<tr>
<td style="width:100%;background-color:#ffffffdbdbe4">
<table style="width:100%;border:1px;padding:0px;margin:0px">
<tr>
</tr>
</table>