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Lucid

Through the hoops

open the Lucid chart and select the share -> embed menu item. click the activate embed code and copy and past the HTML.

its recomended to change the width to 100% and remove the margin and relative setting under style

<div style="width: 100%; height: 520px;">  
<iframe allowfullscreen frameborder="0"
style="width:100%; height:520px"
src="https://www.lucidchart.com/documents/embeddedchart/ee9393c4-427d-4390-97da-1d0a42b5823e"
id="n8kd1lbHuhin">
</iframe>
</div>