Sizing VIMEO Videos is not working

Is there a way to size a vimeo video? I have been using this code to get the video shown but I need it to be larger

https://vimeo.com/18823718

Now I am trying to use this format to no avail:
[vimeo https://vimeo.com/18823718 w=500&h=400]
[vimeo https://vimeo.com/18823718 w=600&h=500]

Here is the page:
https://formpig.com/blog/?p=3253

Does anyone know what is going on here?

Thanks,

Jon