Update _ext/translation_graph.py

 Used CSS variable instead of hardcoded "white" value. Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: hfactor13

_ext/translation_graph.py

@@ -146,7 +146,7 @@ def run(self):
  fig.update_layout(
  paper_bgcolor="rgba(0,0,0,0)",
  plot_bgcolor="rgba(0,0,0,0)",
- hoverlabel_bgcolor="white",
+ hoverlabel_bgcolor="var(--bs-body-bg)",
  hoverlabel_font_color="black",
  font_color="var(--bs-body-color)",
  margin=dict(l=40, r=40, t=40, b=40),