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

website/src/repl/Repl.css

@@ -1,3 +1,15 @@
+:root {
+  --background: #222;
+  --lineBackground: #22222299;
+  --foreground: #fff;
+  --caret: #ffcc00;
+  --selection: rgba(128, 203, 196, 0.5);
+  --selectionMatch: #036dd626;
+  --lineHighlight: #00000050;
+  --gutterBackground: transparent;
+  --gutterForeground: #8a919966;
+}
+
 .darken::before {
   content: ' ';
   position: fixed;
@@ -22,3 +34,18 @@
 #code .cm-line > * {
   background: var(--lineBackground);
 }
+
+#code .cm-editor {
+  background-color: transparent !important;
+  height: 100%;
+  z-index: 11;
+}
+
+#code .cm-theme {
+  width: 100%;
+  height: 100%;
+}
+
+#code .cm-theme-light {
+  width: 100%;
+}