I assume you change the 600 and 300 numbers for each image in the three places (image size, viewbox and max dimensions).
I don't see right off what could be causing your problem, except that maybe max-width and max-height are not working in your reader, or there's something in the "Main" class. You could try adding borders to the <svg> and <div> styles and see if that helps with debugging (they would tell you the true size of the elements).
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