Build system integration using vue-cli.

src/components/DynamicTheme.vue

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+<template>
+  <DynamicStyle>
+    /* light / dark theme switch based on system pref if available */ body #app
+    {
+    {{ getVars(themes.light) }}
+    } @media (prefers-color-scheme: light), (prefers-color-scheme:
+    no-preference) { body #app {
+    {{ getVars(themes.light) }}
+    } } @media (prefers-color-scheme: dark) { body #app { } } /* light / dark
+    theme override base on user choice. */ body #app.is-dark {
+    {{ getVars(themes.dark) }}
+    } body #app.is-light {
+    {{ getVars(themes.light) }}
+    }
+  </DynamicStyle>
+</template>
+
+<script>
+export default {
+  name: "DynamicTheme",
+  props: {
+    themes: Object,
+  },
+  methods: {
+    getVars: function (theme) {
+      let vars = [];
+      for (const themeVars in theme) {
+        vars.push(`--${themeVars}: ${theme[themeVars]}`);
+      }
+      return vars.join(";");
+    },
+  },
+};
+</script>