diff --git a/app/assets/stylesheets/documents/documents.css.erb b/app/assets/stylesheets/documents/documents.css.erb
deleted file mode 100644
index c27f4bf2ff..0000000000
--- a/app/assets/stylesheets/documents/documents.css.erb
+++ /dev/null
@@ -1,55 +0,0 @@
-/*-- copyright
-OpenProject Documents Plugin
-
-Former OpenProject Core functionality extracted into a plugin.
-
-Copyright (C) 2009-2014 the OpenProject Foundation (OPF)
-
-This program is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License version 3.
-
-OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
-Copyright (C) 2006-2013 Jean-Philippe Lang
-Copyright (C) 2010-2013 the ChiliProject Team
-
-This program is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License
-as published by the Free Software Foundation; either version 2
-of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
-
-See doc/COPYRIGHT.rdoc for more details.
-
-++*/
-
-dt.document:before {
-  content: "\e006";
-}
-
-.sidebar--document-sort label:last-of-type {
-  margin-bottom: 2rem;
-}
-
-.document-category-elements {
-  display: inline;
-}
-
-.document-category-elements--header {
-  margin-bottom: 0.25rem;
-}
-
-.document-category-elements--date {
-  margin-bottom: 0.75rem;
-}
-
-.document-category-elements .wiki {
-  margin-bottom: 2rem;
-}
diff --git a/app/assets/stylesheets/documents/documents.sass b/app/assets/stylesheets/documents/documents.sass
new file mode 100644
index 0000000000..60571b98b8
--- /dev/null
+++ b/app/assets/stylesheets/documents/documents.sass
@@ -0,0 +1,51 @@
+/*-- copyright
+ * OpenProject Documents Plugin
+ *
+ * Former OpenProject Core functionality extracted into a plugin.
+ *
+ * Copyright (C) 2009-2014 the OpenProject Foundation (OPF)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 3.
+ *
+ * OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+ * Copyright (C) 2006-2013 Jean-Philippe Lang
+ * Copyright (C) 2010-2013 the ChiliProject Team
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * See doc/COPYRIGHT.rdoc for more details.
+ */
+
+dt.document:before
+  content: "\e006"
+
+.sidebar--document-sort label:last-of-type
+  margin-bottom: 2rem
+
+.document-category--inner-section
+  padding-top: 20px
+
+.document-category-elements
+  display: inline
+
+.document-category-elements--header
+  margin-bottom: 0.25rem
+
+.document-category-elements--date
+  margin-bottom: 0.75rem
+
+.document-category-elements .wiki
+  margin-bottom: 2rem