What is the best way to write the example below?

Question

HTML

What would be the best way to do this part? Through css properties or can I insert an image? I would like to bring the project to the ideal)

Answer 1

Make the lines the borders of the left and right blocks, and give the circles with numbers position: absolute and place them on top of the line

Answer 2

Almost exactly the same as in this example , just border-topdraw.