Scroll box within a webpage

[Thev]

Folks,
Hoping for some advice. I am building a webpage and would like to embed some text within a vertically scrolling panel. Not sure if the attached picture comes through, but I want to create an "application' within a webpage that allows me to control the size of a "viewing box" but have as much information inside as necessary by allowing it to scroll.

I'd prefer to have ready access to the scrolled information to add text or pictures, hyperlinks etc. and would rather not the difficult steps of hosting the information elsewhere on the server and view via an Iframe or creating a placeholder and div tags with text in the placeholder.
Any assistance is appreciated,
Vman