Start Button disappear when using tablet on portrait

[patoperpetua]

Describe the bug
A clear and concise description of what the bug is.
When going to a course main module page, sometimes the start Button does not appear but when I change my tablet to landscape, it appears. Sometimes if I refresh the pages it works well.

This bug is for learn.microsoft.com

To Reproduce
Steps to reproduce the behavior:

1. Go to learn.microsoft.com on a 10 inches tablet on portrait mode.
2. Click on any course and then any module.
3. See there is no start Button, it's only save button

Expected behavior
A
Start Buttonmust be shown

Screenshots
If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: [e
• galaxy tablet 5se
• OSe.android 11
• Browser Chrome
• Version 92.095.15

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