Often in the Elementor Facebook group I see the question
“How do you create a header which is transparent?”
Out of the box Elementor doesn’t do that. And some people would arguable say that this feature should be left with the theme but I beg to differ since Elementor has now included the header and footer templating in their Pro feature. In this tutorial you would need the Pro version though I am sure there is a way that you can create the same without the use of plugins.