Hi Giacomo,
To clarify, may we know what you mean when you say “move” the image inside the Image Block? Are you referring to the position? If so, yes, you’ll need custom CSS.
For instance, if you add change-image-position to the class list of the Image Block, and then add this CSS:
img.change-image-position {
object-position: right top;
}
This should change its position. Reference: https://developer.mozilla.org/en-US/docs/Web/CSS/object-position
Let us know.