Hide text behind an image

Hi, I know having descriptive text on my homepage will help with SEO but I don't want to actually see it on my site.

I'd like to put the text behind the header GIF at the top of my homepage, thanks!

Simon

If you share link to page, we can check easier

Hi, sorry, having trouble finding thread for this.
https://www.simonmannion.com/

You can use this code to Custom CSS box

[data-section-id="642ed5df644676989d3164f4"]:after {
    content: "Simon Mannion";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 30px;
    z-index: -1;
}

Thank you!