Made Preview responsive

[niravasher]

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• [x] tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with grunt jasmine
• [x] code is in uniquely-named feature branch and has no merge conflicts
• [x] PR is descriptively titled
• [x] PR body includes fixes #0000-style reference to original issue #
• [x] ask @publiclab/reviewers for help, in a comment below

We're happy to help you get this ready -- don't be afraid to ask for help, and don't be discouraged if your tests fail at first!

If tests do fail, click on the red X to learn why by reading the logs.

Please be sure you've reviewed our contribution guidelines at https://publiclab.org/contributing-to-public-lab-software

We have a loose schedule of reviewing and pulling in changes every Tuesday and Friday, and publishing changes on Fridays.

Thanks!

[niravasher]

@VladimirMikulic @vaibhavmatta brought from #401