Hello, I sampled the Juneteenth template because I noticed the little firework that appears to be integrated into the inner background. I cannot manipulate this image in any way that I've tried. Moving the elements around does not affect the image, and changing the background color does still change the background but also does not change the little firework. I believe it's a .png with the alpha channel activated as the background and it just sits over the actual inner background allowing the color changing functionality to be maintained. As far as I can tell there is no way to edit it.
So my question is: How was the look in this template actually achieved? Can I use it to my advantage when crafting emails? Currently, when I want image or text elements overlaid on a picture, pattern, or gradient, I have to craft it in photoshop or illustrator and place the entire thing as a jpeg in the email. If I could upload a custom inner background that I can type and place images over, like what I believe is happening in this template, it would greatly help me out making emails for my company