[Improvement] stylelint (#1280)

.stylelintrc

@@ -0,0 +1,10 @@
+{
+  "extends": "stylelint-config-standard",
+  "rules": {
+    "at-rule-no-unknown": null,
+    "number-leading-zero": null,
+    "no-descending-specificity": null,
+    "declaration-colon-newline-after": null,
+    "font-family-no-missing-generic-family-keyword": null
+  }
+}