diff --git a/proof.py b/proof.py
index 4ff6d10..23906e8 100644
--- a/proof.py
+++ b/proof.py
@@ -16,9 +16,9 @@ from superturtle.movement import no_delay
 import typeface
 
 GRID_COLOR = "lightgrey"
-GRID_SIZE = 1
+GRID_SIZE = 0.1
 LETTER_COLOR = "black"
-LETTER_SIZE = 3
+LETTER_SIZE = 0.3
 LETTERS_PER_ROW = 7
 ALPHABET = "abcdefghijklmnopqrstuvwxyz"
 
@@ -48,10 +48,10 @@ def draw_proof_sheet(unit):
         if i > 0 and i % LETTERS_PER_ROW == 0:
             go_to_next_line(unit)
         color(GRID_COLOR)
-        pensize(GRID_SIZE)
+        pensize(GRID_SIZE * unit)
         draw_grid(unit)
         color(LETTER_COLOR)
-        pensize(LETTER_SIZE)
+        pensize(LETTER_SIZE * unit)
         letter_function = getattr(typeface, f"draw_letter_{letter}")
         letter_function(unit)
         fly((GRID_ROWS + 1) * unit)