Card Elements don't respect the font-size of the device

# Bug Report

## Prerequisites

* [x] Can you reproduce the problem on TYPO3 v11.5 LTS
* [x] Can you reproduce the problem on TYPO3 v12.4 LTS
* [x] Did you [perform a cursory search](https://github.com/issues?q=is%3Aissue+user%3Abenjaminkott+repo%3Abenjaminkott%2Fbootstrap_package)
to see if your bug or enhancement is already reported?

## Description
Using the card group provided with `bootstrap-package` on mobile devices the card elements don't scale their `font-size` based on the configured text size of the device. Opening the web page with text size set to "small" has the same result as opening it with text size "ultra large".

## Steps to Reproduce

1. Install the `bootstrap-package`
2. Create a card group with 3 card elements
3. Open the web page on a mobile device with device font set to "small"
4. Open the web page on the same device with device font set to "large"

### Expected behavior

The `font-size` should adjust based on the devices text size.

### Actual behavior

The `font-size` stays the same.

### Screenshots

Small

Large

## Versions

bootstrap-package `14.0.7` on Typo3 `12.4.15`