demos(*): fix inputs spilling over when screen width small

[amcdnl]

Fixes the autocomplete and input examples with a fixed 500px width from spilling over on smaller device screens.

[fxck]

Wouldn't it be worth adding a global .example-form class rather than having the same repeat in each demo.. or at least use variable for those values?

[jelbourn]

@fxck the examples are all meant to be totally standalone so you can just look at one to see what's going on

[jelbourn]

LGTM

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