Paper Input element doesn't work in Polymer 2

I'm working with polymer 2, I download polymer paper input elements, then i add the link tag:

<link rel="import" href="../bower_components/paper-input/paper-input.html">

then:

<paper-input  label="Floating label"></paper-input>

And the browser not showing the input text element

I'm working with the last version of chrome 56.0

Thanks for the help