Footer Slide-Up (7.1)

Hello!

Does anyone know if there is a way to create a footer similar to this example? https://houseofhoney.com/

The site currently has code so that the footer is 'revealed' where the section above it slides up so the footer appears as if it's below/behind the other content.

footer {
     position:sticky !important;
    bottom: 0;
    width: 100vw;
 
}

.system-page {
background:white !important;
z-index:99 !important;
min-height:100vh;
}

#footer-sections {
z-index:0 !important;
}

}

I'm wonder if there is a way to alter the code or implement something new so that instead of the footer being revealed it slides up over the top. 

Thanks!


https://carly-ahlman-design.squarespace.com/
CAD123!