Notify me Button code not applying universally

hey Shopify community.

We have added a code on our liquid theme file to display a notify me button on product page. Currently our theme has two type of branding look and feel. The code below works on our dark theme product pages while the code does not work on our regular theme product page.

My question is, how do we make the code below to apply universally?

.design-pre-order-template-wrapper .notify-me-2-button {
font-size: 17px !important;
font-weight: 700 !important;
background-image: linear-gradient(to right, #7340AD 0%, #E059A6 100%) !important;
border: none !important;
color: white !important;
padding: 10px !important;
text-align: center !important;
text-decoration: none !important;
margin: 4px 2px !important;
border: 2px solid white !important;

Code Works here;
https://pdp.com/products/xbox-series-x-s-pc-victrix-pro-bfg-wireless-controller-white
Code does NOT work here:
https://pdp.com/products/ps5-pc-neptune-blue-airlite-pro-wireless-headset?_pos=2&_sid=f52124001&_ss=r

Hopefully someone can pitch an idea a good code solution.