Centralize empty grid text

Hi,

empty grid template is placed in left-top grids's corner by default. When it's set like this, scrolling horizontally will make template hide. When I try to apply justify-center - it shows in the center of the table and if there is a lot of columns it's hidden on the right side of table. I wonder if it's possible to display empty template always in the middle (vertically and horizontally) of visible part of the grid.