Display the spaces as 3 x 3 grid

[oliverkocsis]

Adjust the Grid.css and Space.css stylesheets so that the spaces are displayed as a 3 x 3 grid.

Hint. CSS Flexbox can be used to turn list of items into multiple columns or raws without modifying the Grid.tsx. In case of using <table> or CSS Grid Layout the list shall be transposed to a matrix (both as a variable and as a layout)