embedded video size (mp4)

I used the “show/hide Kitchen sink” and under “insert/edit embedded media” I added a mp4 video.
Now I just cant figure out how to chage the size of it. (would like to make it bigger).

I can change the Dimentions (In html ore in “insert/edit embedded media”) . And in Edith post Visiual i see the changes in size of the file. But the video it self stays the same size, when wieving the post. (It just moves further towards the middle, when made bigger).

Am I missing somthing? Ore is this not possible?

Cheers.