Claro and Gin theme compatibility

Problem/Motivation

Hello,
There has been a while the last release was out for this module.
The Claro and the Gin themes has been released since then.

Steps to reproduce

Set Claro or Gin as Drupal 10's admin theme and visit the module's admin interface at admin/config/user-interface/ab_test.

Proposed resolution

I've added some CSS changes.

Remaining tasks

I don't use the Google Analytics submodule, so other fixes might be necessary.