Facebook Like button push down my web site content by 1 pixel after load

Like button push down m开发者_运维百科y web site content by 1 pixel after load? What causes this?

The website: http://mihalko.eu/

http://screencast.com/t/0YaQlZPmtRv

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The iframe height is causing that. Give a height to #facebook_like and that should prevent it from moving changing when the iframe height changes. You can even add it a overflow:hidden.