Smashing in-article newsletter form is broken

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- Do you want to request a feature or report a bug? Bug.

- What is the current behavior? Using viewport units is causing some elements to break into a new line.

Also, when focusing the input, I can select the placeholder text, it becomes hard to select the actual input value.

- If the current behavior is a bug, please provide the steps to reproduce.

1. Go to any article.
2. Open the page in a large screen (iMac 27" in my case)

- What is the expected behavior? Font size should be reduced for large screens.

- Please mention your operating system version and the version of your browser Chrome 60, iMac 27"