Easy fixes. Simply adjust the div height and width elements (not the iframe) and it will give you more length or width.

<div style="height: 700px;"><iframe width="100%" height="100%" frameborder="0" src="https://www.cogsworth.com/book/cjif740yt4jse0937jpulj061"></iframe></div>

e.g.

style="height: 1000px;


or

style="width: 500px;

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