Do I have a clash of codes?

Hello

I'm really struggling to add simple code to make a section sticky and think there may be a clash of codes going on?

My client bought a sqsp 7.1 template which has code to make 2 sections sit beside each other. This is the code: <div data-wm-plugin="split-sections" data-split-count="2" data-split-widths="50%, 50%"></div>

I am being asked to make the section containing the above code stick.

I have tried using code to make the section stick. This is the code I used: section[data-section-id="63e963c4d2de5b1e0574130e"], {position: sticky !important;
top:0; }

...but the sticky code only works if I remove the split-sections code.

I don't feel I can share my clients log in info for sqsp so I've recorded a loom to demonstrate: https://www.loom.com/share/3e164af8580f4ed99b36531ab7bdef47?sid=83ffe2af-1655-45fd-a890-3a84c7f18ca9

Can anyone shed any light on what I'm doing wrong.

Thanks so much in advance

First code is Will Myers Split Section Plugin. It has an option to make section sticky. You can contact Template Author to get this code. Or follow this instructions