Gave right!
Just put this code at the beginning, as here in this Order Cancelled model, which is in the mail / (language) folder:
<style>
a img {border: 0;}
@ media only screen and (max-width: 300px) {
body {
width: 218px important;!
margin: auto important;!
}
Added a comma before the closing point, thus:
a img {border: 0}
a img {border: 0;}
Thank you!