Mod to set the color outside of the canvas

Use the pageColor query parameter to specify a color.
Pass "?pageColor=bg" to use the color in settings.bg (the user-defined canvas background color)
Supports anything that can be a color string, but # has to be %23.

mods/page_color.js

@@ -0,0 +1,16 @@
+urlParams = new URLSearchParams(window.location.search);
+
+backgroundUseStrings = ["bg","background","settings.bg"]
+
+if(urlParams.get('pageColor') != null) { //null check
+    color = urlParams.get('pageColor');
+    if(color === "" || color === null) { //NaN check
+        color = "black";
+    };
+    if(backgroundUseStrings.includes(color.toLowerCase())) {
+	!settings.bg ? color = "black" : color = settings.bg;
+        color = settings.bg;
+    };
+};
+
+document.body.style.backgroundColor = color;