olark.configure('system.hb_custom_style', { 
	general: { 
		fonts: [''], 
		corners: '', 
		secondaryColor: '#ffe6ff' 
	} 
});

Notes

Change the color of your visitor messages. This configuration key will only accept hex values.

olark.configure('system.hb_custom_style', {
  general: {
    fonts: [''],
    corners: '',
    secondaryColor: '#ffe6ff'
  }
});

secondary color