Change Background of Streamlit Container

Is there a way to edit the background color of a container? I have an app with a background image and I want to make the background color of a container which stores a dropdown selection input white so it shows up better against the image background

Check out the styllable container from streamlit-extras.

Hereโ€™s some CSS in a solution from before the styllable container was added to streamlit-extras.