If you do see the translation but the design is different, the reason why this might happen is due to the way the page builder or the theme stores the styling for the content. Some store the styling in a custom field (the custom field usually contains the "style" or "css" or "layout" or "styling" wording) and that custom field might need to first be set to "copy" in order to have the styling being carried over to the translated page.
After doing this, you should first make a small change on the default language, then save the page, then go to the translation of that page and re-save it - and the CSS should be copied over.