By default, Eclipse has a white and light gray theme. You can change the theme in the Preferences menu to a darker theme.
There's an alternative to the builtin dark theme named Darkest Dark Theme which looks nicer and helps with the eye strain in those late night coding sessions.
To install it you need to open the Help menu and select Eclipse Marketplece...
This plugin has a small bug that can be workarounded by installing another plugin.
In the search box type the letters wst and press Enter.
Click the Install button on the Eclipse Web Developer Tools.
In the next step you can select which extra packages do you want such as Git integration.
If you don't need them you can leave them unchecked. Once you have accepted the licenses and the plugin has installed you will need to restart Eclipse when prompted.
Open again the Eclipse Marketplace, then type in the search box darkest and press Enter, the Darkest Dark Theme should be the first item on the results list.
Click the Install button, you will be required to accept the licenses and restart Eclipse once it has finished installing.
When Eclipse has restarted you should have an IDE looking like in the following image.
