Support phpMyAdmin 4.8 (+ v4.9 verified)
Put the theme folder to your phpMyAdmin/themes folder
\xampp\phpMyAdmin\themes
/Applications/MAMP/bin/phpMyAdmin
Open phpMyAdmin dashboard and change theme to pmahomme_dark at Appearance settings
Add this settings to your config.inc.php file:
$cfg['ThemeDefault'] = 'pmahomme_dark';
$cfg['ThemePath'] = './themes';
$cfg['ThemeManager'] = true;