fix: improve light/dark theme

Author: andre8244

.storybook/preview.ts

@@ -2,6 +2,7 @@ import type { Preview, VueRenderer } from '@storybook/vue3'
 import { withThemeByClassName } from '@storybook/addon-themes'
 
 import '../src/main.css'
+import './storybook.css'
 
 const preview: Preview = {
   parameters: {

.storybook/storybook.css

@@ -0,0 +1,9 @@
+.sb-show-main.sb-main-padded {
+  /* remove default padding from component area */
+  padding: 0;
+}
+
+#storybook-root {
+  /* set background color according to theme */
+  @apply h-screen bg-gray-50 dark:bg-gray-900;
+}