Embed block preview layout position is not fully aligned with block border.
1. Go to Studio UI.
2. Create new Landing Page.
3. Add an Embed block.
4. Choose content "Media/Images/Visual travels".
5. Submit the settings form.
6. Examine the preview of the added content.
Actual: Preview image does not use the whole space of the block border.
Expected: Preview is aligned with the block border.
Remarks: Please see attached screen-shot.