Invert colors in diagrams if a dark theme is selected.

Author: whitequark

book.toml

@@ -4,6 +4,7 @@ title = "The Amaranth RFC Book"
 [output.html]
 no-section-label = true
 git-repository-url = "https://github.com/amaranth-lang/rfcs"
+additional-css = ["theme/img-color-scheme.css"]
 
 [output.html.search]
 heading-split-level = 0

text/0049-soc-gpio-peripheral/overview.svg

@@ -0,0 +1,10 @@
+.light, .rust {
+    img {
+        color-scheme: light;
+    }
+}
+.ayu, .coal, .navy {
+    img {
+        color-scheme: dark;
+    }
+}