Fixed height, scrollable container for checkboxes

Hi, I am building a chart that a user could select multiple countries. However, a list of countries is too long. How could I wrap the list into a container that the container is fixed height, and I could scroll the container to view the options? Thanks.

The example and the idea comes from the website: Coronavirus (COVID-19) Vaccinations - Statistics and Research - Our World in Data


As per my understanding, I think it would be fine to use selectbox or miltiselect in your usecase.

Let me know if i got it wrong


True, the functionality of multiselect would be fine. Thanks.