diff --git a/themes/atom-dark-ui/atom.css b/themes/atom-dark-ui/atom.less similarity index 100% rename from themes/atom-dark-ui/atom.css rename to themes/atom-dark-ui/atom.less diff --git a/themes/atom-dark-ui/blurred.css b/themes/atom-dark-ui/blurred.less similarity index 100% rename from themes/atom-dark-ui/blurred.css rename to themes/atom-dark-ui/blurred.less diff --git a/themes/atom-dark-ui/command-logger.css b/themes/atom-dark-ui/command-logger.less similarity index 100% rename from themes/atom-dark-ui/command-logger.css rename to themes/atom-dark-ui/command-logger.less diff --git a/themes/atom-dark-ui/command-panel.css b/themes/atom-dark-ui/command-panel.less similarity index 100% rename from themes/atom-dark-ui/command-panel.css rename to themes/atom-dark-ui/command-panel.less diff --git a/themes/atom-dark-ui/editor.css b/themes/atom-dark-ui/editor.less similarity index 100% rename from themes/atom-dark-ui/editor.css rename to themes/atom-dark-ui/editor.less diff --git a/themes/atom-dark-ui/select-list.css b/themes/atom-dark-ui/select-list.less similarity index 100% rename from themes/atom-dark-ui/select-list.css rename to themes/atom-dark-ui/select-list.less diff --git a/themes/atom-dark-ui/status-bar.css b/themes/atom-dark-ui/status-bar.less similarity index 100% rename from themes/atom-dark-ui/status-bar.css rename to themes/atom-dark-ui/status-bar.less diff --git a/themes/atom-dark-ui/tabs.css b/themes/atom-dark-ui/tabs.less similarity index 100% rename from themes/atom-dark-ui/tabs.css rename to themes/atom-dark-ui/tabs.less diff --git a/themes/atom-dark-ui/tree-view.css b/themes/atom-dark-ui/tree-view.less similarity index 100% rename from themes/atom-dark-ui/tree-view.css rename to themes/atom-dark-ui/tree-view.less diff --git a/themes/atom-light-ui/atom.css b/themes/atom-light-ui/atom.less similarity index 100% rename from themes/atom-light-ui/atom.css rename to themes/atom-light-ui/atom.less diff --git a/themes/atom-light-ui/blurred.css b/themes/atom-light-ui/blurred.less similarity index 100% rename from themes/atom-light-ui/blurred.css rename to themes/atom-light-ui/blurred.less diff --git a/themes/atom-light-ui/command-logger.css b/themes/atom-light-ui/command-logger.less similarity index 100% rename from themes/atom-light-ui/command-logger.css rename to themes/atom-light-ui/command-logger.less diff --git a/themes/atom-light-ui/command-panel.css b/themes/atom-light-ui/command-panel.less similarity index 100% rename from themes/atom-light-ui/command-panel.css rename to themes/atom-light-ui/command-panel.less diff --git a/themes/atom-light-ui/editor.css b/themes/atom-light-ui/editor.less similarity index 100% rename from themes/atom-light-ui/editor.css rename to themes/atom-light-ui/editor.less diff --git a/themes/atom-light-ui/overlay.css b/themes/atom-light-ui/overlay.less similarity index 100% rename from themes/atom-light-ui/overlay.css rename to themes/atom-light-ui/overlay.less diff --git a/themes/atom-light-ui/select-list.css b/themes/atom-light-ui/select-list.less similarity index 100% rename from themes/atom-light-ui/select-list.css rename to themes/atom-light-ui/select-list.less diff --git a/themes/atom-light-ui/status-bar.css b/themes/atom-light-ui/status-bar.less similarity index 100% rename from themes/atom-light-ui/status-bar.css rename to themes/atom-light-ui/status-bar.less diff --git a/themes/atom-light-ui/tabs.css b/themes/atom-light-ui/tabs.less similarity index 100% rename from themes/atom-light-ui/tabs.css rename to themes/atom-light-ui/tabs.less diff --git a/themes/atom-light-ui/tree-view.css b/themes/atom-light-ui/tree-view.less similarity index 100% rename from themes/atom-light-ui/tree-view.css rename to themes/atom-light-ui/tree-view.less