Use postcss to combine & minify styles

.gitignore

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+node_modules

assets/css/styles.css

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+@import "./global.css";
+@import "./cube.css";

package.json

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+{
+  "name": "zx-spectrum",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build:css": "postcss assets/css/styles.css > styles.css"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/lewisdaleuk/zx-spectrum-wp.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/lewisdaleuk/zx-spectrum-wp/issues"
+  },
+  "homepage": "https://github.com/lewisdaleuk/zx-spectrum-wp#readme",
+  "devDependencies": {
+    "autoprefixer": "^10.4.13",
+    "cssnano": "^5.1.14",
+    "postcss": "^8.4.21",
+    "postcss-cli": "^10.1.0",
+    "postcss-import": "^15.1.0",
+    "postcss-import-ext-glob": "^2.1.1"
+  }
+}

postcss.config.js

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+module.exports = {
+    plugins: [
+        require('postcss-import-ext-glob'),
+        require('postcss-import'),
+        require('autoprefixer'),
+        require('cssnano')({
+            preset: 'default',
+        }),
+    ]
+};