Paper Input area line disappears when you change screen resloutions

[prasanjeetd]

Please change the resolution of the screen of web browser and check the input area line disappears,

https://elements.polymer-project.org/elements/paper-input?view=demo:demo/index.html&active=paper-input

[eob]

Another way to evoke this bug is to change the padding of, for example, the card-content box of a paper-card surrounding it: