tab indicator is not located correctly in firefox when padding exists

[rodrigoGA]

when padding is added to super-tabs-toolbar the indicator works badly in firefox, in chrome it works correctly.

https://youtu.be/uaszZdZ7gTQ

I am adding padding as follows

@media (min-width: 768px) {
  super-tabs super-tabs-toolbar {
    margin: 0;
    padding-right: calc((100% - 1080px) / 2);
    padding-left: calc((100% - 1080px) / 2);
  }
}