Remove unused function

app.py

@@ -117,12 +117,6 @@ background_color = color_picker('Background color', key="backgroundColor", defau
 secondary_background_color = color_picker('Secondary background color', key="secondaryBackgroundColor", default_color=default_color.secondaryBackgroundColor, l_only=True)
 
 
-def parse_hex(rgb_hex_str: str) -> tuple[float, float, float]:
-    if not re.match(r"^#[0-9a-fA-F]{6}$", rgb_hex_str):
-        raise ValueError("Invalid hex color")
-    return tuple(int(rgb_hex_str[i:i+2], 16) / 255 for i in (1, 3, 5))
-
-
 st.header("WCAG contrast ratio")
 st.markdown("""
 Check if the color contrasts of the selected colors are enough to the WCAG guidelines recommendation.