docs: fix

Author: alexander-akait

README.md

@@ -1018,18 +1018,26 @@ document.onclick = () => {
 };
 ```
 
-**src/dark-theme/\_vars**
+**src/dark-theme/\_vars.scss**
 
 ```scss
 $background: black;
 ```
 
-**src/light-theme/\_vars**
+**src/light-theme/\_vars.scss**
 
 ```scss
 $background: white;
 ```
 
+**src/styles.scss**
+
+```scss
+body {
+  background-color: vars.$background;
+}
+```
+
 **public/index.html**
 
 ```html