Removing Background from a generated image

I’m generating an image from some html code, and then I want to convert that HTML code to an image. For this, I used a zap: https://zapier.com/apps/bubble/integrations/htmlcss-to-image
Currently, it generates the image but there seems to be whitespace around the image generated. The image is originally an oval shape, but the API from Zapier that is converting the HTML to Image is adding whitespace around this oval image.
Any tips on how to get rid of this whitespace from the generated image?

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