Tips-&-Tricks.md

@@ -382,3 +382,35 @@ You should get the following error:
 You have now successfully disabled password based authentication in `ssh`.
 
 (Related discussion on this topic can be found in the community forum: https://forums.puri.sm/t/tutorial-enable-key-based-authentication-via-ssh-on-your-librem-5/13137)
+
+### Setting a Custom Background in Phosh
+
+Selected background image can be a .jpg or a .png, possibly other file types.
+
+In the terminal, create the file `gtk.css` using any installed text editor: `nano ~/.config/gtk-3.0/gtk.css`. Alternately, you can create the file manually in the `Files` app.
+
+Then add the following to the `gtk.css` file. (Change the path to point to your chosen image.)
+
+```
+/*
+ * Set a background for the lockscreen.
+ */
+phosh-lockscreen, .phosh-lockshield {
+  background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
+                    url('file:///home/purism/Pictures/mybackground.jpg');
+  background-size: cover;
+  background-position: center;
+}
+
+/*
+ * Set a background for the app grid.
+ */
+phosh-app-grid {
+  background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
+                    url('file:///home/purism/Pictures/mybackground.jpg');
+  background-size: cover;
+  background-position: center;
+}
+```
+
+Then: `sudo systemctl restart phosh`.
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