Squarespace 7.0 trying to change a background image without resizing

Site URL: https://www.voteforerica.com/

I am trying to replace an image on the home page but every time I switch out the image, it resizes itself and I can't adjust it. I reached out to squarespace and they told me that there's custom code on the page that someone did before I worked on the page. I'm not good with code and would love any guidance on how to change out the background picture and leave everything else the same.

Add to Design > Custom CSS

section#home-top {
    background-image: url(https://cdn.pixabay.com/photo/2022/07/01/17/58/lighthouse-7296029__480.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
}