Update custom-css.md

vizro-core/docs/pages/user-guides/custom-css.md

@@ -319,7 +319,7 @@ To ensure your CSS adapts to theme changes, we recommend using CSS variables (`v
 comprehensive list of available variable names, refer to the
 [Bootstrap documentation](https://getbootstrap.com/docs/5.3/customize/css-variables/). Note that our
 Bootstrap stylesheet is still under development, so not all Bootstrap variables are currently available.
-Additionally, you can define your own CSS variables, as demonstrated in the example on
+You can also define your own CSS variables, as demonstrated in the example on own CSS variables, as demonstrated in the example on
 [changing the container background color](#change-the-styling-of-a-container).
 
 ### Turn off page title