How to Change Theme to Dark in Spring Tool Suite (sts) and Eclipse

Darkest Dark is now DevStyle - a free plugin providing an enhanced set of experiences for Eclipse. Included:

• Darkest Dark theme - #1 in the Marketplace:
  True dark theme with flat replacement icons
  A great experience over Windows, Mac and Linux
   
• Included with DevStyle:
  New light and dark color themes
  All new startup experience for Eclipse
  Inline search for text editors