I configured the "post bottom" slot to see how it would look in the embed, and it generated a horizontal scrollbar in the desktop view — even though I only enabled sizes that are much smaller than the embed’s width.
While I’m at it, I also noticed that on mobile, the right margin of the posts is wider than the left margin (i don’t think it’s related to the ads).
https://tecnoblog.net/noticias/alexa-do-brasil-ganha-nova-voz-e-fica-mais-inteligente/