renandepaula on "[Plugin: Featured Images in RSS w/ Size and Position] Mailchimp size and positioning doesn't work"

Hi, I'm trying to use RSS image for Mailchimp campaign.

The image works fine, but only shows the size and positioning option with CSS doesn't work at all.
I have tried some solutions already solved in this forum, but nothing worked.

The style code I'm Using:

<style type="text/css">.rss-content img {float: left;margin-right: 10px;width: 150px;}
img.CToWUd.a6T{float: left;margin-right: 10px;width: 150px;padding-right:15px;}
</style>

And mailchimp tags

*|RSSITEMS:|*
*|RSSITEM:TITLE|*

*|RSSITEM:CONTENT_FULL|*
Leia mais >>
*|RSSITEM:LIKE|*

Can you help?
My feed url: http://www.donacoelha.com/feed

https://wordpress.org/plugins/featured-images-for-rss-feeds/