Apparently Apple mail ignores the width/height if specified in
attributes, but work in style, so let's do both.
Ref: https://www.caniemail.com/features/html-width/, point 3.
{%block content%}
<div>
- <img style="float: left" height="50" width="50" src="cid:slonik.png" alt="PostgreSQL logo">
- <img style="float: right" height="50" width="50" src="cid:slonik.png" alt="PostgreSQL logo">
+ <img style="float: left; width: 50px" height="50" width="50" src="cid:slonik.png" alt="PostgreSQL logo">
+ <img style="float: right; width: 50px" height="50" width="50" src="cid:slonik.png" alt="PostgreSQL logo">
<h1>{{news.title}}</h1>
</div>
{{news.content|markdown}}