How to change error message color

Hi All

I just installed LoginPress plugin and changed it all colors as per my site color scheme, the only issue is when I logout from my system, it shows a message on the top or login form “You are now logged out.” on the left side of the message there is a vertical bar of default blue color, how can I change its color? please advice

here is the link for reference https://www.enterlie.com/capture.jpg

Thanks
Baljit

The page I need help with: [log in to see the link]