This box, like the others, is set to "display: inline-block", with "width:400px" Note that it does not act responsively.
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Same as above, but with "max-width:400px".Two problems: width never less than specified amount, and not horizontally alighned in full-width window.
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Now is "display:inline" and "max-width:400px".
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Now is "display:block" and "max-width:400px". This narrows down properly.
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