Change the size of embedded videos on every page

I have a site with around 100 pages of different embedded videos (all currently varying in size) but i would like to sort of develop a standard and keep them all one size. So my dilemma is that i do not want to go through 100 pages and edit all their sizes. Is there anyway through PHP, CSS or anything else that can change them all without manually changing every single one?

Thanks

 

By adding CSS ...

embed { width:500px;height:500px;}

Code (markup):

If that does not work try this:

embed { width:500px !important;height:500px !important;}

Code (markup):

 

it worked! thank you so much! that will save me lots of time...

oh just one more thing, i also have chatboxes on my site that use the <embed> tags... how would i make it so these are excluded from being changed in size?

 

Give them a seperate class:

embed[COLOR="Red"].chatbox[/COLOR]{ width:500px;height:500px;}

Code (markup):

then find your chat boxes and add:

class="chatbox"

Code (markup):

just inside the tags.