Hi Sebastian,
none of our component change files of Helix, sorry but this is a ridiculous suggestion.
But becuase template styles (css) are loaded AFTER sp page builder styles from template.css may override some styles from component, but to "fix / correct" that you can use custom.css as we suggest in Helix documenation. And as you can read in docs as well, template.css file is reloaded so please DO NOT manually edit that file.
Just create a new custom.css file and add there:
img {display:inline-block}
But this is not recommended for all images on whole website, so I suggest rethink your CSS concept and use that change for selected areas (classes) only.
If you want to make custom changes in offcanvas.php file - do it, and then change file permission from 644 to 444 - it will stop override by template update.