How to change the size of my + and - buttons - Boost theme

Topic summary

A user encountered oversized plus (+) and minus (-) buttons when adding items to cart in a mix-and-match bundle on their Shopify store using the Boost theme. The buttons appeared abnormally large, disrupting the page layout.

Problem Details:

  • Initial attempts to fix by changing CSS from “flex” to “block” with set height/width were unsuccessful
  • The buttons originated from an app integration, requiring custom code solution

Solution Provided:
A custom CSS code snippet was shared to be added in theme.liquid above the </body> tag. This code targets the app-generated buttons and constrains their size.

Outcome:

  • The solution successfully resolved the sizing issue
  • User confirmed the fix worked as intended
  • Thread marked as resolved
Summarized with AI on November 2. AI used: claude-sonnet-4-5-20250929.

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