diff --git a/data/tags.yml b/data/tags.yml
index eeb36f5..3ee1f34 100644
--- a/data/tags.yml
+++ b/data/tags.yml
@@ -1089,9 +1089,9 @@ ways:
   - tags: {"area:highway": "*"}
 
   - tags: {boundary: "*"}
-    stroke: boundary_color
-    stroke-width: 0.3
-    stroke-dasharray: 10,5
+    # stroke: boundary_color
+    # stroke-width: 0.3
+    # stroke-dasharray: 10,5
     priority: 60
 
 tags_to_write: [
diff --git a/roentgen/flinger.py b/roentgen/flinger.py
index 4c97e7e..5a84859 100644
--- a/roentgen/flinger.py
+++ b/roentgen/flinger.py
@@ -3,6 +3,8 @@ Author: Sergey Vartanov (me@enzet.ru)
 
 Geo projection.
 """
+from typing import Optional
+
 import numpy as np
 
 from roentgen.util import MinMax
@@ -66,11 +68,15 @@ class Flinger:
 
         return result
 
-    def get_scale(self, coordinates: np.array) -> float:
+    def get_scale(self, coordinates: Optional[np.array] = None) -> float:
         """
         Return pixels per meter ratio for the given geo coordinates.
 
         :param coordinates: geo coordinates
         """
-        scale_factor = 1 / np.cos(coordinates[0] / 180 * np.pi)
+        if coordinates is None:
+            # Get pixels per meter ratio for the center of the boundary box.
+            coordinates = self.geo_boundaries.center()
+
+        scale_factor: float = 1 / np.cos(coordinates[0] / 180 * np.pi)
         return self.pixels_per_meter * scale_factor
diff --git a/roentgen/mapper.py b/roentgen/mapper.py
index b8aa5b5..77d9404 100644
--- a/roentgen/mapper.py
+++ b/roentgen/mapper.py
@@ -240,9 +240,10 @@ class Painter:
                 self.svg.add(p)
         ui.progress_bar(-1, 0, text="Drawing ways")
 
-        # Building shade
+        # Draw building shade.
 
-        building_shade = Group(opacity=0.1)
+        building_shade: Group = Group(opacity=0.1)
+        length: float = self.flinger.get_scale()
 
         for way in constructor.buildings:  # type: Building
             shift = [2 * way.get_levels(), 0 * way.get_levels()]
@@ -257,9 +258,10 @@ class Painter:
 
         self.svg.add(building_shade)
 
-        previous_level: float = 0
+        # Draw buildings.
 
-        height = 1
+        previous_level: float = 0
+        height: float = self.flinger.get_scale()
 
         for level in sorted(constructor.levels):
             fill: Color()
@@ -274,8 +276,8 @@ class Painter:
                     elif level == 1:
                         fill = Color("#C3C3C3")
                     else:
-                        a = 0.8 + segment.angle * 0.2
-                        fill = Color(rgb=(a, a, a))
+                        color_part: float = 0.8 + segment.angle * 0.2
+                        fill = Color(rgb=(color_part, color_part, color_part))
 
                     self.svg.add(self.svg.path(
                         d=("M", np.add(segment.point_1, shift_1), "L",
@@ -286,7 +288,7 @@ class Painter:
                         fill=fill.hex, stroke=fill.hex, stroke_width=1,
                         stroke_linejoin="round"))
 
-                # Draw roof.
+                # Draw building roof.
 
                 if way.get_levels() == level:
                     shift = np.array([0, -way.get_levels() * height])