diff --git a/roentgen.py b/roentgen.py
index 5287d6c..63d45bb 100644
--- a/roentgen.py
+++ b/roentgen.py
@@ -197,7 +197,7 @@ def draw_element(options):
 
     output_file_path: Path = workspace.output_path / "element.svg"
     svg = svgwrite.Drawing(str(output_file_path), size.astype(float))
-    for style in scheme.get_style(tags, 18):
+    for style in scheme.get_style(tags):
         style: LineStyle
         path = svg.path(d="M 0,0 L 64,0 L 64,64 L 0,64 L 0,0 Z")
         path.update(style.style)
diff --git a/roentgen/constructor.py b/roentgen/constructor.py
index a58979a..d114ebf 100644
--- a/roentgen/constructor.py
+++ b/roentgen/constructor.py
@@ -217,8 +217,7 @@ class Constructor:
             self.roads.append(Road(line.tags, inners, outers, road_matcher))
             return
 
-        scale: float = self.flinger.get_scale(center_coordinates)
-        line_styles: list[LineStyle] = self.scheme.get_style(line.tags, scale)
+        line_styles: list[LineStyle] = self.scheme.get_style(line.tags)
 
         for line_style in line_styles:
             self.figures.append(
@@ -318,9 +317,7 @@ class Constructor:
                 self.construct_line(relation, inners_path, outers_path)
 
     def construct_nodes(self) -> None:
-        """
-        Draw nodes.
-        """
+        """Draw nodes."""
         sorted_node_ids: Iterator[int] = sorted(
             self.osm_data.nodes.keys(),
             key=lambda x: -self.osm_data.nodes[x].coordinates[0],
@@ -334,6 +331,7 @@ class Constructor:
         ui.progress_bar(-1, len(self.osm_data.nodes), text="Constructing nodes")
 
     def construct_node(self, node: OSMNode) -> None:
+        """Draw one node."""
         tags = node.tags
         if not self.check_level(tags):
             return
@@ -360,7 +358,7 @@ class Constructor:
             )
             point: Point = Point(
                 icon_set, [], tags, processed, flung, node.coordinates,
-                priority=0, draw_outline=False
+                draw_outline=False
             )  # fmt: skip
             self.points.append(point)
             return
diff --git a/roentgen/scheme.py b/roentgen/scheme.py
index 95f2cae..b3c6ec0 100644
--- a/roentgen/scheme.py
+++ b/roentgen/scheme.py
@@ -4,7 +4,7 @@ Röntgen drawing scheme.
 from dataclasses import dataclass
 from enum import Enum
 from pathlib import Path
-from typing import Any, Optional, Tuple, Union
+from typing import Any, Optional, Union
 
 import yaml
 from colour import Color
@@ -145,11 +145,13 @@ class Matcher:
             [get_selector(x, y, prefix) for (x, y) in self.tags.items()]
         )
 
-    def get_clean_shapes(self):
+    def get_clean_shapes(self) -> Optional[list[str]]:
+        """Get list of shape identifiers for shapes."""
         return None
 
-    def get_style(self):
-        return None
+    def get_style(self) -> dict[str, Any]:
+        """Return way SVG style."""
+        return {}
 
 
 class NodeMatcher(Matcher):
@@ -189,9 +191,10 @@ class NodeMatcher(Matcher):
         if "with_icon" in structure:
             self.with_icon = structure["with_icon"]
 
-    def get_clean_shapes(self):
+    def get_clean_shapes(self) -> Optional[list[str]]:
+        """Get list of shape identifiers for shapes."""
         if not self.shapes:
-            return
+            return None
         return [(x if isinstance(x, str) else x["shape"]) for x in self.shapes]
 
 
@@ -210,11 +213,12 @@ class WayMatcher(Matcher):
                     self.style[key] = scheme.get_color(style[key]).hex.upper()
                 else:
                     self.style[key] = style[key]
-        self.priority = 0
+        self.priority: int = 0
         if "priority" in structure:
             self.priority = structure["priority"]
 
-    def get_style(self):
+    def get_style(self) -> dict[str, Any]:
+        """Return way SVG style."""
         return self.style
 
 
@@ -276,7 +280,7 @@ class Scheme:
         self.prefix_to_skip: list[str] = content["prefix_to_skip"]
 
         # Storage for created icon sets.
-        self.cache: dict[str, Tuple[IconSet, int]] = {}
+        self.cache: dict[str, tuple[IconSet, int]] = {}
 
     def get_color(self, color: str) -> Color:
         """
@@ -330,7 +334,7 @@ class Scheme:
         tags: dict[str, Any],
         processed: set[str],
         for_: str = "node",
-    ) -> Tuple[IconSet, int]:
+    ) -> tuple[IconSet, int]:
         """
         Construct icon set.
 
@@ -437,10 +441,8 @@ class Scheme:
 
         return returned, priority
 
-    def get_style(self, tags: dict[str, Any], scale):
-        """
-        Get line style based on tags and scale.
-        """
+    def get_style(self, tags: dict[str, Any]):
+        """Get line style based on tags and scale."""
         line_styles = []
 
         for matcher in self.way_matchers:
@@ -452,6 +454,7 @@ class Scheme:
         return line_styles
 
     def get_road(self, tags: dict[str, Any]) -> Optional[RoadMatcher]:
+        """Get road matcher if tags are matched."""
         for matcher in self.road_matchers:
             if not matcher.is_matched(tags):
                 continue
@@ -461,9 +464,7 @@ class Scheme:
     def construct_text(
         self, tags: dict[str, str], draw_captions: str, processed: set[str]
     ) -> list[Label]:
-        """
-        Construct labels for not processed tags.
-        """
+        """Construct labels for not processed tags."""
         texts: list[Label] = []
 
         name = None
@@ -536,9 +537,7 @@ class Scheme:
         return texts
 
     def is_area(self, tags: dict[str, str]) -> bool:
-        """
-        Check whether way described by tags is area.
-        """
+        """Check whether way described by tags is area."""
         for matcher in self.area_matchers:
             if matcher.is_matched(tags):
                 return True
diff --git a/roentgen/server.py b/roentgen/server.py
index d2cdc43..b2bde5f 100644
--- a/roentgen/server.py
+++ b/roentgen/server.py
@@ -1,3 +1,6 @@
+"""
+Röntgen tile server for sloppy maps.
+"""
 import logging
 from http.server import BaseHTTPRequestHandler, HTTPServer
 from pathlib import Path
@@ -16,7 +19,9 @@ class Handler(BaseHTTPRequestHandler):
     HTTP request handler that process sloppy map tile requests.
     """
 
-    def __init__(self, request, client_address, server):
+    def __init__(
+        self, request: bytes, client_address: tuple[str, int], server
+    ):
         super().__init__(request, client_address, server)
         self.cache: Path = Path("cache")
         self.update_cache: bool = False
@@ -49,7 +54,8 @@ class Handler(BaseHTTPRequestHandler):
                 return
 
 
-def ui(options):
+def ui(options) -> None:
+    """Command-line interface for tile server."""
     server: Optional[HTTPServer] = None
     try:
         port: int = 8080
diff --git a/roentgen/taginfo.py b/roentgen/taginfo.py
index e694191..7d36102 100644
--- a/roentgen/taginfo.py
+++ b/roentgen/taginfo.py
@@ -72,11 +72,13 @@ class TaginfoProjectFile:
                 tags.append(tag)
 
     def write(self) -> None:
+        """Write Taginfo JSON file."""
         with self.path.open("w+") as output_file:
             json.dump(self.structure, output_file, indent=4, sort_keys=True)
 
 
 def write_taginfo_project_file(scheme: Scheme) -> None:
+    """Write Taginfo JSON file."""
     out_file: Path = workspace.get_taginfo_file_path()
     logging.info(f"Write Röntgen project file for Taginfo to {out_file}...")
     taginfo_project_file: TaginfoProjectFile = TaginfoProjectFile(
diff --git a/roentgen/tile.py b/roentgen/tile.py
index a79820d..36be2a9 100644
--- a/roentgen/tile.py
+++ b/roentgen/tile.py
@@ -7,7 +7,7 @@ import logging
 import sys
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Optional, Tuple
+from typing import Optional
 
 import numpy as np
 import svgwrite
@@ -174,7 +174,7 @@ class Tile:
         lat_deg: np.ndarray = np.degrees(lat_rad)
         return np.array((lat_deg, lon_deg))
 
-    def get_boundary_box(self) -> Tuple[np.array, np.array]:
+    def get_boundary_box(self) -> tuple[np.array, np.array]:
         """
         Get geographical boundary box of the tile: north-west and south-east
         points.
@@ -272,9 +272,7 @@ class Tile:
 
 
 def ui(options) -> None:
-    """
-    Simple user interface for tile generation.
-    """
+    """Simple user interface for tile generation."""
     directory: Path = workspace.get_tile_path()
 
     if options.coordinates:
diff --git a/test/test_style.py b/test/test_style.py
index 3722897..2de08d5 100644
--- a/test/test_style.py
+++ b/test/test_style.py
@@ -9,16 +9,16 @@ __email__ = "me@enzet.ru"
 
 def test_style_empty() -> None:
     """Test constructing style of empty tags."""
-    assert SCHEME.get_style({}, 18) == []
+    assert SCHEME.get_style({}) == []
 
 
 def test_style_unknown() -> None:
     """Test constructing style of unknown tags."""
-    assert SCHEME.get_style({"aaa": "bbb"}, 18) == []
+    assert SCHEME.get_style({"aaa": "bbb"}) == []
 
 
 def test_style_area() -> None:
     """Test constructing style of landuse=grass."""
-    style = SCHEME.get_style({"landuse": "grass"}, 18)
+    style = SCHEME.get_style({"landuse": "grass"})
     assert len(style) == 1
     assert style[0].style == {"fill": "#CFE0A8", "stroke": "#BFD098"}