Games do annoying viewport resizing when embedded in a minicade on mobile

[toolness]

For instance, on my iPhone, the following wreaks havoc on my viewport as minicade switches between the metagame and the minigame:

http://minica.de/f/catch-the-yellow-monster

Specifically, it looks like this:

[toolness]

Adding the following CSS to the export template seems to fix it on the iPhone:

@media (max-width: 320px) {
  #phaser-holder {
    max-width: 320px;
  }
}

Not a huge fan of the fix, but it's the only one I've found so far.