Font Ssize decrease of product description words on Spotlight theme 16.0

Shopify Discussion
1

Needed some assistance on how I can decrease the font size of the words within the product description that talks about the details of my product .

Screenshot 2026-09-18 at 9.27.01 PM
Screenshot 2026-09-18 at 9.27.01 PM1476Ă—822 67.2 KB

2

Hi! This should be possible with a small CSS adjustment without changing the font size across the rest of your store.

The exact CSS selector depends on your theme and on how that product details section is being rendered, so I wouldn’t recommend applying a generic rule to all product text.

Which Shopify theme are you using? If you share the theme name, I can point you to the specific CSS rule to target only the product description/details area shown in your screenshot.

3

:waving_hand:
The Font size scale slider for Body text can’t go below 100%, which is already the default, so this needs a bit of section CSS.

In Edit theme, use the Home page drop-down to open your product template, click the section that holds your description, then Custom CSS at the bottom of its panel. Paste this and click Save:

.product__description,
.product__description * {
  font-size: 1.3rem;
}

Your theme’s own product CSS styles that block as .product__description, and the second selector also covers lines set as a heading in the description’s Formatting menu. Your published theme reports Spotlight 14.0.0, not 16.0, so paste it into the theme you’re actually looking at.

Duplicate your theme first, and note Shopify Support won’t troubleshoot forum code.

If this sorted it, marking it as the solution helps the next person find it.