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Scrollbars vary by device and may be invisible on some mobile devices.
The rest of the text is hidden and so you won't be able to see it.
<div id="div168"> Lorem Ipsum Dolor Sit Amet </div>

This bottom scroll bar is completely unnecessary, the div is big enough already.
<div id="div169"> Lorem Ipsum Dolor Sit Amet. Maecenas tristique venenatis magna quis cursus. </div>

With 'auto', scrollbars are only added when needed.
<div id="div170"> Lorem Ipsum Dolor Sit Amet. Maecenas tristique venenatis magna quis cursus.</div>

The content overflowing doesn't affect the rest of the page flow, so the browser view box does not expand to accommodate it.
<div id="div171"> Lorem Ipsum Dolor Sit Amet. Maecenas tristique venenatis magna quis cursus. </div>