Experiment card proportions on tablet

**Describe the bug**
In portrait orientation on a tablet, the experiment cards within the landing page are more than twice as wide than their height, this can be a tricky aspect ratio for users to add a fitting cover photo.

**To Reproduce**
Steps to reproduce the behavior:
1. Create an experiment
2. Look at the experiments overview page (landing page)

**Expected behavior**
The height of the experiment card should grow according to the width to keep (about) the same aspect ratio as on a smaller phone screen. This is also the behaviour on iOS.

**Screenshots**
Android:

iOS:

Reproduce the issue on an Android tablet in portrait orientation by creating an experiment and opening the experiments overview landing page. Inspect the experiment card layout and compare it with the phone and iOS screenshots; done means the card height grows with its width and preserves approximately the same aspect ratio.

Written by the indexing model from the issue text.