Replacing csslint by stylelint

.stylelintrc

@@ -0,0 +1,13 @@
+{
+  "extends": "stylelint-config-standard",
+  "rules": {
+    "at-rule-empty-line-before": null,
+    "block-closing-brace-newline-before": null,
+    "color-hex-case": null,
+    "max-empty-lines": 2,
+    "no-descending-specificity": null,
+    "indentation": null,
+    "rule-empty-line-before": null,
+    "selector-list-comma-newline-after": null
+  }
+}