diff --git a/termstr/termstr.py b/termstr/termstr.py
index fa595e2..aecf36c 100644
--- a/termstr/termstr.py
+++ b/termstr/termstr.py
@@ -147,9 +147,9 @@ class CharStyle:
         underline_code = ("text-decoration:underline; "
                           if self.is_underlined else "")
         fg_color = (self.fg_color if type(self.fg_color) == tuple
-                    else xterm_colors[self.fg_color])
+                    else XTERM_COLORS[self.fg_color])
         bg_color = (self.bg_color if type(self.bg_color) == tuple
-                    else xterm_colors[self.bg_color])
+                    else XTERM_COLORS[self.bg_color])
         return (f"<style>.S{id(self)} {{font-size:80%%; color:rgb{fg_color!r};"
                 f" background-color:rgb{bg_color!r}; "
                 f"{bold_code}{italic_code}{underline_code}}}</style>")
@@ -212,7 +212,7 @@ class TermStr(collections.UserString):
                     is_italic = True
                 elif code in ["04", "4"]:  # underline
                     is_underlined = True
-                elif code_int and 30 <= code_int <= 37 :  # dim fg color
+                elif code_int and 30 <= code_int <= 37:  # dim fg color
                     fg_color = int(code[1])
                 elif code_int and 40 <= code_int <= 47:  # dim bg color
                     bg_color = int(code[1])
diff --git a/termstr/tests/termstr_test.py b/termstr/tests/termstr_test.py
index d802b45..6bfa00d 100755
--- a/termstr/tests/termstr_test.py
+++ b/termstr/tests/termstr_test.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3.9
 
 
-import os
 import pickle
 import unittest