Adding package file to theme and using scss instead of css.

theme/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "batflip",
+  "version": "1.0.0",
+  "description": "Theme for Batflip scoring.",
+  "main": "index.js",
+  "scripts": {
+    "build": "sass styles.scss ../public/assets/style.css"
+  },
+  "author": "Dan Chadwick",
+  "license": "MIT"
+}

theme/reset.scss

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+/* 1. Use a more-intuitive box-sizing model */
+*, *::before, *::after {
+  box-sizing: border-box;
+}
+
+/* 2. Remove default margin */
+* {
+  margin: 0;
+}
+
+/* 3. Enable keyword animations */
+@media (prefers-reduced-motion: no-preference) {
+  html {
+    interpolate-size: allow-keywords;
+  }
+}
+
+body {
+  /* 4. Add accessible line-height */
+  line-height: 1.5;
+  /* 5. Improve text rendering */
+  -webkit-font-smoothing: antialiased;
+}
+
+/* 6. Improve media defaults */
+img, picture, video, canvas, svg {
+  display: block;
+  max-width: 100%;
+}
+
+/* 7. Inherit fonts for form controls */
+input, button, textarea, select {
+  font: inherit;
+}
+
+/* 8. Avoid text overflows */
+p, h1, h2, h3, h4, h5, h6 {
+  overflow-wrap: break-word;
+}
+
+/* 9. Improve line wrapping */
+p {
+  text-wrap: pretty;
+}
+h1, h2, h3, h4, h5, h6 {
+  text-wrap: balance;
+}
+
+/*
+  10. Create a root stacking context
+*/
+#root, #__next {
+  isolation: isolate;
+}

theme/styles.scss

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+@import "reset";
+
+body {
+  background: orange;
+}
+
+img {
+  max-width: 100%;
+  display: block;
+}