Embed resize goes wrong?

Hello,

I can not get my vimeo embeds resized. I tried everything I could find on the web. Tried different h & w settings in the code, in media I set the h & w, but it seems like nothing works. (set thumbnails pic’s h & w work)

On the visual page in wordpress I can see it become smaller, but on the actual site it is huge.

What do I need to do?

Regards,
Thijmen