Bebshow

Hi. How I can calculate and store a variable to give the height of the "cordes" block. Because when I use the variable Y of the vertical block, the cordes (ropes, strings) are not the right length? I tried to transform into PX, in%, I tried to recover the height of the main block, to subtract vertical from the main block and other simple calculations but each time, a 50% or X2 ratio applies is this possible, or it would be better to use svg with two lines ? Thank you for your attention and your responses. #Edit I just added Position Absolute to .vertical and his top and left.