CSS overflow property does not work

Hello.


I have a little problem with the overflow property on this site I'm developing:
www.evairpeterson.com.br/duvidas/overflownaofunciona.html

The problem is that the vertical scroll bar does not appear when the text on the "right" DIV too long.
I want that in cases like this, where the list goes TEST 1 to TEST 99 a vertical scroll barappears to the right side of the page.

Usually I add the CSS "right" DIV the this code:


But I don't know which reason it does not work in this case.
Someone can help me solve this problem?


I'm grateful to anyone who can help me.
I apologize for the mistakes of writing, but my fluency in your language is not the best.
Greetings from Brazil, Evair.

Talking to a friend from Portugal here comes the solution, as your orientation:


So what kept the DIV "right" exactly as it was and just changed the overflow DIV "major" HIDDEN to AUTO.
And with that rather I have 100% of my problem solved, the most appropriate way possible.

I hope this information will help someone in the future.
I appreciate everyone's attention. Evair.