Fix: Explorable explanation bugs and minor issues

[amovar18]

Description

This PR aims to fix EE bugs and issues that were found in the QA of Explorable Explanations.

Relevant Technical Choices

Testing Instructions

Additional Information:

The following is a checklist of the errors fixed in this PR:

• Fix error “The devicemotion events are blocked by permissions' policy”.
• Fix warning “Permissions policy violation: accelerometer is not allowed in this document.”
• In “Interactive Mode”, when the user hovers over the info icon, the cursor doesn’t change to pointer.
• Arrows are becoming darker in interactive mode (happens in interactive mode where arrows are drawn on one another).
• Checkboxes in the top bar do not align well when using small screen size.

Screenshot/Screencast

---

Checklist

• I have thoroughly tested this code to the best of my abilities.
• I have reviewed the code myself before requesting a review.
• This code is covered by unit tests to verify that it works as intended.
• The QA of this PR is done by a member of the QA team (to be checked by QA).

Partially addresses #857

[mohdsayed]

All mentioned issued are fixed. Thanks