Block size and alignment

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Is there a way to align blocks horizontal in edit mode?
And the question that comes with that one: can you alter the size of edit blocks?

For example: I have an parent div that is 600px wide with an area code in it.
I made a blocktype for that specific block.
When I hit edit, the famous red dots appear around the block, but it is 600px wide and also as high as the block, so when I add one, the next one is aligned under another block in the layout.
I would like to align them horizontal in the parent block and give them a fixed width.

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