fix colors in converter

src/config.py

@@ -72,6 +72,22 @@ class LawCartaConfig:
         "Verdana": "verdana,geneva,sans-serif"
     }
 
+    COLORS = {
+        '#ffff00': 'yellow',
+        '#00ff00': 'darkYellow',
+        '#00ffff': 'cyan',
+        '#ff00ff': 'magenta',
+        '#0000ff': 'blue',
+        '#ff0000': 'red',
+        '#000080': 'darkBlue',
+        '#008080': 'darkCyan',
+        '#008000': 'green',
+        '#800080': 'darkMagenta',
+        '#808000': 'darkGreen',
+        '#c0c0c0': 'lightGray',
+        '#ffffff': 'white',
+    }
+
 
 class BookApiWrapper:
     def __init__(self, access, logger_object, book_id=0):

src/html_preprocessor.py

@@ -91,10 +91,10 @@ class HTMLPreprocessor:
             if style:
                 style = self.convert_font_pt_to_px(style)
                 if style != "":
-                    if color and color != '#000000':
+                    if color and color in LawCartaConfig.COLORS:
                         style += f'; color: {color};'
                     font.attrs["style"] = style
-            elif color and color != '#000000':
+            elif color and color in LawCartaConfig.COLORS:
                 font.attrs["style"] = f'color: {color};'
 
             if face is not None: