diff --git a/.stylelintignore b/.stylelintignore
new file mode 100644
index 00000000..f321fd05
--- /dev/null
+++ b/.stylelintignore
@@ -0,0 +1,5 @@
+coverage/
+assets/stylesheets/angular-*
+assets/stylesheets/bootstrap-*
+assets/stylesheets/*.min.css
+assets/stylesheets/jquery.tagit.css
diff --git a/.stylelintrc.json b/.stylelintrc.json
new file mode 100644
index 00000000..4e01a95d
--- /dev/null
+++ b/.stylelintrc.json
@@ -0,0 +1,163 @@
+{
+  "rules": {
+    "at-rule-no-unknown": true,
+    "block-no-empty": true,
+    "color-no-invalid-hex": true,
+    "comment-no-empty": true,
+    "declaration-block-no-duplicate-properties": [
+      true,
+      {
+        "ignore": [
+          "consecutive-duplicates-with-different-values"
+        ]
+      }
+    ],
+    "declaration-block-no-redundant-longhand-properties": true,
+    "declaration-block-no-shorthand-property-overrides": true,
+    "font-family-no-duplicate-names": true,
+    "font-family-no-missing-generic-family-keyword": true,
+    "function-calc-no-unspaced-operator": true,
+    "function-linear-gradient-no-nonstandard-direction": true,
+    "keyframe-declaration-no-important": true,
+    "media-feature-name-no-unknown": true,
+    "no-descending-specificity": true,
+    "no-duplicate-at-import-rules": true,
+    "no-duplicate-selectors": true,
+    "no-empty-source": true,
+    "no-extra-semicolons": true,
+    "no-invalid-double-slash-comments": true,
+    "property-no-unknown": true,
+    "selector-pseudo-class-no-unknown": true,
+    "selector-pseudo-element-no-unknown": true,
+    "selector-type-no-unknown": true,
+    "string-no-newline": true,
+    "unit-no-unknown": true,
+    "at-rule-empty-line-before": [
+      "always",
+      {
+        "except": [
+          "blockless-after-same-name-blockless",
+          "first-nested"
+        ],
+        "ignore": [
+          "after-comment"
+        ]
+      }
+    ],
+    "at-rule-name-case": "lower",
+    "at-rule-name-space-after": "always-single-line",
+    "at-rule-semicolon-newline-after": "always",
+    "block-closing-brace-empty-line-before": "never",
+    "block-closing-brace-newline-after": "always",
+    "block-closing-brace-newline-before": "always-multi-line",
+    "block-closing-brace-space-before": "always-single-line",
+    "block-opening-brace-newline-after": "always-multi-line",
+    "block-opening-brace-space-after": "always-single-line",
+    "block-opening-brace-space-before": "always",
+    "color-hex-case": "lower",
+    "color-hex-length": "short",
+    "comment-empty-line-before": [
+      "always",
+      {
+        "except": [
+          "first-nested"
+        ],
+        "ignore": [
+          "stylelint-commands"
+        ]
+      }
+    ],
+    "comment-whitespace-inside": "always",
+    "custom-property-empty-line-before": [
+      "always",
+      {
+        "except": [
+          "after-custom-property",
+          "first-nested"
+        ],
+        "ignore": [
+          "after-comment",
+          "inside-single-line-block"
+        ]
+      }
+    ],
+    "declaration-bang-space-after": "never",
+    "declaration-bang-space-before": "always",
+    "declaration-block-semicolon-newline-after": "always-multi-line",
+    "declaration-block-semicolon-space-after": "always-single-line",
+    "declaration-block-semicolon-space-before": "never",
+    "declaration-block-single-line-max-declarations": 1,
+    "declaration-block-trailing-semicolon": "always",
+    "declaration-colon-newline-after": "always-multi-line",
+    "declaration-colon-space-after": "always-single-line",
+    "declaration-colon-space-before": "never",
+    "declaration-empty-line-before": [
+      "always",
+      {
+        "except": [
+          "after-declaration",
+          "first-nested"
+        ],
+        "ignore": [
+          "after-comment",
+          "inside-single-line-block"
+        ]
+      }
+    ],
+    "function-comma-newline-after": "always-multi-line",
+    "function-comma-space-after": "always-single-line",
+    "function-comma-space-before": "never",
+    "function-max-empty-lines": 0,
+    "function-name-case": "lower",
+    "function-parentheses-newline-inside": "always-multi-line",
+    "function-parentheses-space-inside": "never-single-line",
+    "function-whitespace-after": "always",
+    "indentation": 2,
+    "length-zero-no-unit": true,
+    "max-empty-lines": 1,
+    "media-feature-colon-space-after": "always",
+    "media-feature-colon-space-before": "never",
+    "media-feature-name-case": "lower",
+    "media-feature-parentheses-space-inside": "never",
+    "media-feature-range-operator-space-after": "always",
+    "media-feature-range-operator-space-before": "always",
+    "media-query-list-comma-newline-after": "always-multi-line",
+    "media-query-list-comma-space-after": "always-single-line",
+    "media-query-list-comma-space-before": "never",
+    "no-eol-whitespace": true,
+    "no-missing-end-of-source-newline": true,
+    "number-leading-zero": "always",
+    "number-no-trailing-zeros": true,
+    "property-case": "lower",
+    "rule-empty-line-before": [
+      "always-multi-line",
+      {
+        "except": [
+          "first-nested"
+        ],
+        "ignore": [
+          "after-comment"
+        ]
+      }
+    ],
+    "selector-attribute-brackets-space-inside": "never",
+    "selector-attribute-operator-space-after": "never",
+    "selector-attribute-operator-space-before": "never",
+    "selector-combinator-space-after": "always",
+    "selector-combinator-space-before": "always",
+    "selector-descendant-combinator-no-non-space": true,
+    "selector-list-comma-newline-after": "always",
+    "selector-list-comma-space-before": "never",
+    "selector-max-empty-lines": 0,
+    "selector-pseudo-class-case": "lower",
+    "selector-pseudo-class-parentheses-space-inside": "never",
+    "selector-pseudo-element-case": "lower",
+    "selector-pseudo-element-colon-notation": "double",
+    "selector-type-case": "lower",
+    "unit-case": "lower",
+    "value-list-comma-newline-after": "always-multi-line",
+    "value-list-comma-space-after": "always-single-line",
+    "value-list-comma-space-before": "never",
+    "value-list-max-empty-lines": 0
+  }
+}
diff --git a/app/models/additionals_tag.rb b/app/models/additionals_tag.rb
index 94bd88af..accc3feb 100644
--- a/app/models/additionals_tag.rb
+++ b/app/models/additionals_tag.rb
@@ -29,9 +29,7 @@ class AdditionalsTag
                        else
                          Project.where(Project.allowed_to_condition(User.current, permission)).pluck(:id)
                        end
-    unless projects_allowed.empty?
-      cond << "#{Project.table_name}.id IN (#{projects_allowed.join(',')})"
-    end
+    cond << "#{Project.table_name}.id IN (#{projects_allowed.join(',')})" unless projects_allowed.empty?
     cond
   end
 
diff --git a/lib/additionals.rb b/lib/additionals.rb
index a660e4e1..f007c4f0 100644
--- a/lib/additionals.rb
+++ b/lib/additionals.rb
@@ -32,9 +32,7 @@ module Additionals
         target = name.constantize
         patch = "#{plugin_id.camelize}::Patches::#{name}Patch".constantize
 
-        unless target.included_modules.include?(patch)
-          target.send(:include, patch)
-        end
+        target.send(:include, patch) unless target.included_modules.include?(patch)
       end
     end
 
diff --git a/lib/additionals/wiki_macros/calendar_macro.rb b/lib/additionals/wiki_macros/calendar_macro.rb
index 737f7038..6470247c 100644
--- a/lib/additionals/wiki_macros/calendar_macro.rb
+++ b/lib/additionals/wiki_macros/calendar_macro.rb
@@ -57,9 +57,7 @@ module Additionals
     s = string.split
     s.each do |d|
       con = Date.strptime(d, '%Y-%m-%d')
-      unless con.nil?
-        selected << "new Date(#{con.year},#{con.month - 1},#{con.mday})"
-      end
+      selected << "new Date(#{con.year},#{con.month - 1},#{con.mday})" unless con.nil?
     end
     selected
   end