fix: dupe style.css to Repl.css

for some reason they were missing after update
+ darken line backgrounds
+ change preview port to keep workbox out of dev server

packages/core/draw.mjs

@@ -1,6 +1,6 @@
 /*
 draw.mjs - <short description TODO>
-Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/tone/draw.mjs>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/core/draw.mjs>
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
@@ -13,7 +13,7 @@ export const getDrawContext = (id = 'test-canvas') => {
     canvas.id = id;
     canvas.width = window.innerWidth;
     canvas.height = window.innerHeight;
-    canvas.style = 'pointer-events:none;width:100%;height:100%;position:fixed;top:0;left:0;z-index:5';
+    canvas.style = 'pointer-events:none;width:100%;height:100%;position:fixed;top:0;left:0';
     document.body.prepend(canvas);
   }
   return canvas.getContext('2d');

packages/react/src/components/style.css

@@ -1,6 +1,6 @@
 :root {
   --background: #222;
-  --lineBackground: #22222250;
+  --lineBackground: #22222299;
   --foreground: #fff;
   --caret: #ffcc00;
   --selection: rgba(128, 203, 196, 0.5);