youtube frame size

Hi guys

why does the code not work by customize a frame size of a youtube video on a page???

code is: [su_youtube url=”https://www.youtube.com/watch?v=yDymhltvj18″ width=”540″ height=”360″]

and here the link to the page:
http://www.fluidlife.at/wp/index.php/aquafitness-2/

any recommendations are welcome
thx!

https://ww.wp.xz.cn/plugins/shortcodes-ultimate/