Position and style of back button in web - User Experience Stack

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. Button position: A.1 Right side seems

user behavior - What is the best method to choose between two options in UI? - User Experience Stack Exchange

Designing A Better Back Button UX — Smashing Magazine

position - How to improve UX for multiple buttons which are in one place with different functionality - User Experience Stack Exchange

Crafting Intuitive Mobile Navigation: Design Patterns and Best Practices, by Sourav Mahapatra

Back-to-Top Button Design Guidelines

A complete UI glossary: 100 terms all designers should know - UX Design Institute

Design with the web in mind. Back button, URL design, keyboard…, by Chloe Sanderson

Back Button UX – Smart Interface Design Patterns

Front-End vs. Back-End Development: What's the Difference?

4 Design Patterns That Violate “Back” Button UX Expectations – 59% of Sites Get It Wrong – Articles – Baymard Institute