Centre Image on order e-mails

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I am wondering if someone could please help me.


I am in the notification section and editing the templates for e-mails sent when a customer orders. I have centred my logo and it shows as this in the preview. On the coding I put:

img {
display: block;
margin-left: auto;
margin-right: auto;

However, when I test it and receive the e-mail in Outlook, the image is to the left and the order number is to the right of the image when this text should be on the next line below the image.

If anyone can help pleaseeeee thanks so much.