Remove vertical border between cells?

Hello,

Is there a way to remove the vertical border between cells? I'm trying to remove just the ones that are part of a single day, not the ones between two days.

I looked in the code, but each vertical line has only one css class: scheduler_default_matrix_vertical_line

And setting the background-color to transparent will hide all of them.

Is there a way to differenciate between vertical lines and hide just the ones I need?

Thanks!