## Stroke.back_color property Gets or sets the background color of the stroke. ```python @property def back_color(self) -> aspose.pydrawing.Color: ... @back_color.setter def back_color(self, value:......```python doc = aw.Document() builder = aw.DocumentBuilder(doc=doc)...format.stroke.transparency = 0.5 doc.save(file_name=ARTIFACTS_DIR...