CSS cleanup

plugins/talk-plugin-auth/client/stream/components/SignInButton.js

@@ -2,11 +2,17 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { Button } from 'plugin-api/beta/client/components/ui';
 import { t } from 'plugin-api/beta/client/services';
+import styles from './SignInButton.css';
 
 const SignInButton = ({ currentUser, showSignInDialog }) => (
   <div className="talk-stream-auth-sign-in-button">
     {!currentUser ? (
-      <Button id="coralSignInButton" onClick={showSignInDialog} full>
+      <Button
+        id="coralSignInButton"
+        className={styles.button}
+        onClick={showSignInDialog}
+        full
+      >
         {t('talk-plugin-auth.login.sign_in_to_comment')}
       </Button>
     ) : null}