How to float against Centre Column

I am looking for the code to define for a piece of content to float up against the left hand side of the center column:

If I use float: left; then a piece of content floats against the left hand side of the entire website. Thus if the window is small - the content overlaps with the center column.

If the window is very large, it is very far away from the centre column.


What I would like is for that piece of content to float up against the left hand side of the centre column (outside the center column that is in the background area) regardless of how large the window is.


Can you help me, please?

Thanks,
Ann.