Implement scroll-to-top feature

[Daodu111]

Fixes

• Fixes [Feature] Add a scroll-to-top element to UX for longer page contexts #54 by @possumbilities

Description

I created a scroll-to-top feature that uses only HTML and CSS and follows the instructions of using pseudeoelements to solve the issue.

Technical details

It uses only HTML and CSS

Tests

Screenshots

Checklist

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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[possumbilities]

changes to this file should be removed they're not a part of this repo

[possumbilities]

Hi! @Daodu111 This is a lot of good work, and the start of a very good direction!

The visual styling of this button is really nice, however we don't utilizing drop shadows in other instances and the use of it here is a bit of a UX collision. Additionally the choice of color is too attention-seeking the neutral grey would be a better direction.

It's placement is too far to the right, and too close to the bottom of the window. It should likely appear once the page has reached a great height, and well after any sidebar area of content might occur; and likely be positioned somewhere closer to the middle of the sidebar area's location.

The button also needs to be an element that could occur within the HTML of every page, but only become visible on longer pages. Please see the original Issue on the mention of pseudo classes to obscure the element.

CSS pseudo elements using z-index stack positions and variable percentage based heights would offer a means to "reveal" the button after a degree of scrolling, and to visually hide the element on pages which do not reach a particular length.

(you'll also need to resolve the current conflicts with the PR as well)