cambiar el tamaño de la fuente de btn-group con css in javascript

Assuming you have a btn-group defined in your HTML and you want to change the font size of its contents using CSS in JavaScript, you can do the following:

index.tsx
const btnGroup = document.querySelector('.btn-group');
btnGroup.style.fontSize = '16px'; // Change the font size to 16 pixels
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Here, we first select the btn-group element using document.querySelector(), and then we set its fontSize property to the desired value, which is 16px in this case.

You can adjust the value of fontSize according to your needs.