Problem with containers height


I started to create first site for challenge (“Tribute Page”). And I have a serious and very annoying issue. I have two containers and I want them to have the same height value. I can set fixed height for both of them but the text will splash and go outside the container on smaller monitor I use. So - how to set the two containers to be same height and look the same on different sizes (17" and 24" as well)? Because on smaller screen it looks like:

My tribute page:

Thanks in advance!

add css:
overflow: auto;
to the timeline div
or just make it longer whene the screen size is small by using css @media

Hey, thanks for reply!

Making overflow: auto works, although it creates this scrollbar in this container. I have to hide it somehow. Thanks again!