Gnome 3.30.2 : Ignoring length property that isn't a number at line 753, col 24

[asegarra]

Got error on Fedora packaged arc-theme, tried from github and get the same error. I see the error if I go to the application overview

[fossfreedom]

Please can you look at gtk.css in your packaged themes folder and let us know the lines 750 - 756 - so that we can confirm where the issue is - please can you highlight line 753

[zilliu]

I got the same issue on my laptop.
In the Arc/gtk.css file there is only one line:

import url("resource:///org/gnome/arc-theme/gtk-main.css");

I guess you may be looking for the Arc/gnome-shell/gnome-shell.css, which is the file gnome-shell loads that I found in system log. The 751-756 lines are below:

#panel #panelActivities.panel-button > * {
  background-image: url("common-assets/panel/activities.svg");
  background-position: center top;  /* Line 753 */
  width: 24px;
  height: 24px;
  background-color: transparent !important;