diff --git a/src/diana/templ/templ.svg b/src/diana/templ/templ.svg
--- a/src/diana/templ/templ.svg
+++ b/src/diana/templ/templ.svg
@@ -15,7 +15,7 @@
 	<defs>
 		<style type="text/css"><![CDATA[
 		{% block style %}
-			rect{fill:white;stroke:black;stroke-width:1px}
+			rect{fill:{{bgcolor or "white"}};stroke:black;stroke-width:1px}
 			text{font-family:"DejaVu Sans";text-anchor:middle}
 			line{stroke:black;stroke-width:0.7px}
 			circle{stroke:black}