Option 2 - Widgets
Steps 1 to 7 are the same as option 1 above.
Next steps depend on whether you use Sections/Columns or Flexbox
8. Add a Container or Spacer to the top of "About", name it "Top Left"
9. Set the Layout -> Width and Max Height to 70px
10. Set the Border style for Top and Left, Right and Bottom must be 0
11. Set Advanced -> Position to Absolute
12. Set Advanced -> Horizontal Orientation to "Left"
13. Set Advanced -> Vertical Orientation to "top"
14. Duplicate the "Top Left" Container/Widget
15. Set Advanced -> Horizontal Orientation to "Right"
16. Set Advanced -> Vertical Orientation to "bottom"
17. Set the border bottom and right, set top and left to 0