Broke out the nespaint.scss into a number of sub-styles and renamed nespaint.scss to style.scss . Updated Server for these changes.

sass/canvas.scss

+#painter{
+  background-color: $canvas-bg-color;
+  width:100%;
+  height:100%;
+}

sass/core.scss

+body{
+  background-color: $main-bg-color;
+  font-family: $sys-font;
+  color: $main-text-color;
+}
+
+.content-wrapper{
+  width:100%;
+  height:100%;
+  overflow:hidden;
+}
+
+.simple-padding{
+  padding-top: 4px;
+  padding-left: 8px;
+  padding-right: 8px;
+}
+
+.text-align-right{
+  text-align: right;
+}
+
+
+

sass/header.scss

+.pure-menu{
+  background-color: $menu-bg-color;
+  color: $menu-text-color;
+}
+
+
+span.color-NES-06{
+  background-color:#000;
+  color:#A80020;
+}

sass/nespaint.scss → sass/modal.scss

-
-body{
-  background-color:#303030;
-  font-family: 'Roboto', sans-serif;
-}
-
-.pure-menu{
-  background-color:#6200EE;
-  color:#FFF;
-}
-
-#painter{
-  background-color:#212121;
-  width:100%;
-  height:100%;
-}
-
-.content-wrapper{
-  width:100%;
-  height:100%;
-  overflow:hidden;
-}
-
-.simple-padding{
-  padding-top: 4px;
-  padding-left: 8px;
-  padding-right: 8px;
-}
-
-.text-align-right{
-  text-align: right;
-}
-
-div.NES-palette{
-  font-size:0.55em;
-}
-
-.NES-palette button{
-  width:2rem;
-}
-
-span.color-NES-06{
-  background-color:#000;
-  color:#A80020;
-}
-
 /* NOTE: Modal styles were borrowed from
  * https://www.w3schools.com/howto/howto_css_modals.asp
  * and modified.
   border: 1px solid #888;
   width: 80%; /* Could be more or less, depending on screen size */
 }
-
-
-

sass/nespalette.scss

+div.NES-palette{
+  font-size:0.55em;
+}
+
+.NES-palette button{
+  width:2rem;
+}

sass/style.scss

+
+// Variables and Mixins
+@import 'variables';
+
+// Site components
+@import 'core';
+@import 'header';
+@import 'canvas';
+@import 'nespalette';
+@import 'modal';
+
+

sass/variables.scss

+
+$sys-font: 'Roboto', sans-serif;
+
+$main-bg-color: #303030;
+$main-text-color: #EFEFEF;
+
+$menu-bg-color: #6200EE;
+$menu-text-color: #FFFFFF;
+
+$canvas-bg-color: #212121;

server.js

 
 const sass = require("sass");
 const SASS_PATH = path.join(__dirname, "sass");
-const CSS_PATH = path.join(__dirname, "app/css");
+const SASS_FILE = "style.scss";
 
 const watcher = require("chokidar").watch(SASS_PATH, {ignored: /[\/\\]\./, persistent: true});
 
 var sslCertPath = process.env.SSLCERTPATH || null;
 var sslCaPath = process.env.SSLCAPATH || null;
 
-
-var css_output = "" // Used to hold dynamic css.
+var css_output = ""; // Used to hold dynamic css.
 
 // -------------------------------------------------------
 // Simple helper function
   };
 }
 
-var generateCSS = debounce(function(src, dst, cb){
+var generateCSS = debounce(function(src, cb){
   sass.render({file: src}, (err, res)=>{
     if (err){
       cb("Failed to generate css - " + err.toString());
 // ----------------------------------------------------
 // Watching for any needed file updates (to minimize the need to restart the server.
 watcher.on('ready', () => {
-  var dst = path.join(CSS_PATH, "nespaint.css");
-  fs.access(dst, fs.constants.F_OK, (err) => {
-    // Only try generating a new CSS if one doesn't already exists, or FORCECSSREGEN is true
-    if (err || forceCSSRegen){
-      generateCSS(path.join(SASS_PATH, "nespaint.scss"), path.join(CSS_PATH, "nespaint.css"), (err) => {
-        if (err){
-          console.log("ERROR: " + err);
-          exit();
-        } else {
-          startServer();
-        }
-      });
-    } else {
-      startServer();
-    }
-  });
+    generateCSS(path.join(SASS_PATH, SASS_FILE), (err) => {
+      if (err){
+        console.log("ERROR: " + err);
+        exit();
+      } else {
+        startServer();
+      }
+    }); 
 });
 watcher.on('change', (fpath) => {
-  generateCSS(path.join(SASS_PATH, "nespaint.scss"), path.join(CSS_PATH, "nespaint.css"), (err) => {
+  generateCSS(path.join(SASS_PATH, SASS_FILE), (err) => {
     if (err)
       console.log("WARNING: " + err);
   });