How to center Login dialog box?

[DaveJones]

Hi guys,
I have a large ultrawide monitor and the positioning of the login dialog box has always bothered me. It's positioned to the far left and I feel like I have to bend my neck to see it. Every other OS has their login box in the middle of the screen and I'd like to position in there as well. How would I go about accomplishing that?

Thanks!

Dave

[Cosmo.]

Open the login screen settings and switch to another theme.

[invex]

It's easy. Login themes are in /usr/share/mdm/html-themes
I modified Mint-X using this tip https://goo.gl/1VsI0U
All you have to do is to modify theme.css
Just make sure you delete the original margin-left: 80px;
(I attached my theme.css)