CSS help matching specific span class

Below is a code snippet that is output of a SharePoint page.  I need help selecting the <span class="ms-rteElement-btnWhite1">Want to style only this span</span> line below.   I realize I could just do "span.ms-rteElement-btnWhite1" but this formats it everywhere else it's found on the page.  Is it possible for me to just apply a style to it only when it's in the code below?

<td class="ms-cui-gallery-td ms-cui-gallery-element-sizeCustom">
	<div class="ms-cui-gallerybutton ms-cui-gallerybutton-SizeCustom ms-cui-gallerybutton-highlighted">
		<div tabindex="0" title="White Button" class="ms-cui-gallerybutton-a">
			<div class="ms-rte-stylePreview ms-rte-styleGalleryPreview">
				<div class="ms-rte-stylePreviewBox">
					<div class="ms-rte-stylePreviewBoxInner">
						<div class="ms-rte-stylePreviewHolder">
							<span style="white-space: nowrap;">
								<span class="ms-rteElement-btnWhite1">Want to style only this span</span>
							</span>
						</div>
					</div>
				</div>
				<div class="ms-rte-stylePreviewTitle ms-cui-ctl-mediumlabel">White Button</div>
			</div>
		</div>
	</div>
</td>

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Thanks!
greddinAsked:
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Russ SuterConnect With a Mentor Commented:
Depending on how detailed you want to get you can specify parent tags be included in your CSS defintion. In the most extreme case of your example above, your CSS declaration would look something like this:
td.ms-cui-gallery-td.ms-cui-gallery-element-sizeCustom > div.ms-cui-gallerybutton.ms-cui-gallerybutton-SizeCustom.ms-cui-gallerybutton-highlighted > div.ms-cui-gallerybutton-a > div.ms-rte-stylePreview > div.ms-rte-stylePreviewBox > div.ms-rte-stylePreviewBoxInner > div.ms-rte-stylePreviewHolder > span > span.ms-rteElement-btnWhite1 {
  background-color: green;
}

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This is the most detailed selection I could come up with. It's very specific but not guaranteed to be unique. It's possible, however unlikely, that the exact hierarchy could appear elsewhere on your page.

Here's a jsfiddle proof of concept: https://jsfiddle.net/ptc1kz0s/

I had to add the <table> and <tr> tags to make it work as a <td> tag without an enclosing <table> and <tr> is not strictly valid HTML and the CSS won't match on that.
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greddinAuthor Commented:
As always Russ.  Thank you for your help.  Exactly what I needed to understand.
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