WKHTMLTOX isn't giving exact HTML output

[Netra]

Hi,

I am using DinkToPDF wrapper and WKHTMLTOX.dll in .Net Core App. I am facing issue with formatting in exported PDF. I have been trying to align chart but padding, height, margin, chart properties nothing has worked so far. I came across a site "https://www.nrecosite.com/pdf_generator_net.aspx" which is using WKHTML as a wrapper and giving me expected output. Any urgent help is highly appreciated.

Code :

JSFiddle Link for input html and expected output : 

https://jsfiddle.net/Netra104/gvn3fzj4/3/

PDF Output :

Thanks,

Netra