RESOLVED: Help setting height on div with scroll bar

[Content Nerd]

Figured this out. My style attributes were ok (except that missing;), but there was another build error that was preventing my style changes from taking effect.
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HTML5 output. Responsive layout. Finally figured out what div tag to set Overflow: Scroll on, but it puts a vertical scroll bar the entire length of the text in the div, which kind of defeats the purpose of a vertical scroll bar. I've tried adding the height parameter in the style code below, and have tried various percentages and pixels, but I either get no text visible, or all of the text visible. Can anyone enlighten me on the correct attributes to set a fixed-height scrolling area in a div? It's taken me all morning to get this far so I'd appreciate an assist to the finish here. Thank you!

div.info-section > div:nth-child(2)
{
width: 16.667%;
height: 100px
margin-left: 2%;
overflow: scroll
}