Position and style of back button in web

After studying about the 'Back' button, I still can't decide on which best suited my case. I am designing an internal portal where the content varies in width.

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Button position:

A.1

  • Right side seems like a more common location for the buttons.
  • In other pages, where there is the 'Back' and 'Next' button, it makes more sense that the next button is on the right side of the page.

A.2

  • left side is good since the location of the button would stay regardless of width size of content.

Style:

B.1

  • I also saw some platform that replaced their back button at the bottom with an arrow beside the page title.
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