Changing the Colour of GNOME (GDM) Login Box on Ubuntu 18.04

in Ubuntu 18.04 by default the login-screen uses /usr/share/gnome-shell/theme/ubuntu.css file..

the Orange color #dd4814 is from this portion

.login-dialog-user-list {
  spacing: 12px;
  padding: .2em;
  width: 23em; }
  .login-dialog-user-list:expanded .login-dialog-user-list-item:selected {
    background-color: #dd4814;
    color: #ffffff; }
  .login-dialog-user-list:expanded .login-dialog-user-list-item:logged-in {
    border-right: 2px solid #dd4814; }

you can edit the color according to your preferences in above field..

i have configured it to blue color

enter image description here

Changing the Colour of GNOME (GDM) Login Box on Ubuntu 18.04

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