HTML: How to create a DIV with only vertical scroll-bars for long paragraphs?

You need to specify the width and height in px:

width: 10px; height: 10px;

In addition, you can use overflow: auto; to prevent the horizontal scrollbar from showing.

Therefore, you may want to try the following:

<div style="width:100px; height:100px; overflow: auto;" >
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
  text text text text text text text text text
</div>

to hide the horizontal scrollbars, you can set overflow-x to hidden, like this:

overflow-x: hidden;

Use overflow-y. This property is CSS 3.