Update app.py

app.py

@@ -57,7 +57,7 @@ def draw_grid(data):
     # Setting the grid size
     nrows, ncols = data['size']['rows'], data['size']['columns']
     ax.set_xlim(0, ncols)
-    ax.set_ylim(0, nrows)
+    ax.set_ylim(nrows, 0)
     ax.set_xticks(range(ncols+1))
     ax.set_yticks(range(nrows+1))
     ax.grid(True)