Trying to display a thumbnail gallery wthout a plugin (manually).

Here is a sample page: https://www.millerfoodguide.com/?page_id=518

Here is a sample of the image code I am using:

<a href="https://www.millerfoodguide.com/wp-content/uploads/2014/08/白族饭店3.jpg"><img class="alignnone size-medium wp-image-529" src="https://www.millerfoodguide.com/wp-content/uploads/2014/08/白族饭店3.jpg" alt="白族饭店3" width="150" height="120" /></a><a href="https://www.millerfoodguide.com/wp-content/uploads/2014/08/白族饭店9.jpg"><img class="alignnone size-medium wp-image-535" src="https://www.millerfoodguide.com/wp-content/uploads/2014/08/白族饭店9.jpg" alt="白族饭店9" width="90" height="90" /></a>

I cannot find a thumbnail gallery plugin that is truly free or that works well. So I am inserting thumbnails manually. The ideal size (for an unmodified, uncropped original image) is 120×120. But many are cropped, so to make the line of thumbnails all even, I adjust the size so they are the same size on the screen. But will this make them all even on ANYONE’s screen, on ANY browser, or just on my screen? Thanks!

[ No bumping please. ]