fix: Apply the center alignment to the Badge and Button

[HoonBaek]

Issue

SBISSUE-14550
We've used display: inline-block inside of the Badge and Button.
But it breaks the center alignment in the FireFox browser, so need to change to using display: inline-flex and add more properties for center alignment

Fix

• Apply the center alignment to the Badge and Button components (in FireFox)

Changelog

• Fixed a bug where center alignment of Badge and Button components breaking in FireFox browser

[chohongm]

LGTM!