Shopify guide
Add a Christmas Countdown to Shopify
A MerryMeter iframe can sit inside a Custom Liquid section, keeping the countdown isolated from your storefront code.
Create the widget
Use the MerryMeter builder and copy the iframe code. A 600×260 layout works well for most content areas.
Open the theme editor
In Shopify, go to Online Store → Themes → Customize, then add a Custom Liquid section.
Paste and position
Paste the iframe code, save, and drag the section to the desired position on the page.