I guess this line needs to be adjusted with this upcoming sass change https://sass-lang.com/documentation/breaking-changes/slash-div https://github.com/digitalmanufaktur/shopware6-manu-theme/blob/c27eabe928b548a1c47398dd8e848adb6d760f62/src/Resources/app/storefront/src/scss/abstract/functions/strip-unit.scss#L22