How to remove Google Remarketing or Conversion iFrame white space

I have encountered a weird problem some time ago and I had to do some research to solve it. I was working on a website and added a Google Conversion iFrame code. Google recommends to add the conversion tracking tag between the body tags (). After that, I realized that the top of the website had a weird white space. That was looking ugly and I needed to remove that. I did some research on Google and found a CSS solution which was perfect.

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