Hi there,
it stacks on mobile, as for most featured images unless those were really small, would mean there isn’t room for that style.
You can try adding this CSS to keep it on mobile:
@media(max-width: 768px) {
.post-image-aligned-left #page .inside-article .featured-image {
float: left;
margin-right: 1em;
text-align: left;
}
}
And i would recommend this CSS as well:
.post-image-aligned-left #page .inside-article .featured-image {
max-width: 50%;
}
This will stop the image from every being wider then 50% of the content. Otherwise you end up with very narrow columns of text on some screen sizes.