There are too many levels of indirection in that statement making my brain feel numb so can you please rephrase?
Are you wanting the red panel to start the red panel underneath the buttons and to then have it pop up to the same level of the buttons?
Or, are you wanting the red panel to start at a similar distance from the left button, as it is from the next?
Or is it something else?
If it's the middle option, you can just make it visible and set its left position to be the same as its width, that being 47px