Minus 15mm From the Length and Height

Step 1 of 4

Select the middle reference point and ensure the heights and lengths are constrained

Step 2 of 4

Isolate background if the design is grouped or isolate the clipping mask if it is a clipping mask

Step 3 of 4

Minus 15mm from the height and length.

This is 1.5mm @ 10% scale

Step 4 of 4

Exit the Isolation and fit the artboard to the artwork