You can apply CSS style to it. Here is an example. Try it out by pasting the whole code in a new HTML document. See how it goes. Analyse the structure and suit it with your web requirements.
<span style="overflow:auto;height: 100px; width:100px;">
The contents of the text which you want to be in the scroll box. This one can be adjusted accordingly. Set the width to how wide you want it to be and set the height to how tall you want it to be. You can set about anything for this box. Try it out.