How can I configure the font size for the tree item in the package explorer in Eclipse?

Question

How can I configure the font size for the tree item in the package explorer/outline in Eclipse?

Which item in Font under Preferences I should change?

Answer 1

Ubuntu, Eclipse v4.4 (Luna)^*

1. Locate your: eclipse/plugins/org.eclipse.ui.themes_1.0.1.v20140819-1717/css
2. Pick the CSS file that you are using per Preferences → General → Appearance inside the Eclipse UI.

3. Backup the original and add something like the following, after first closing Eclipse just for safety:

   .MPart Tree { font-size: 14; }

^{*It was performed on ScalaIDE version of Eclipse v4.4 (Luna) and should be the same for regular Eclipse v4.4 (Luna), I think.}