In addition to those three lines of docs specific CSS, let's add two more lines to help put some margin around the example button in the docs.

This should do it:
#modalsInPhone .button { margin: 10px; } /* Gives the button some room so it isn't right up against the edge of the iPhone */
#myModal .button { margin: 0; } /* Saves our close button from getting the margin applied to it */