chore: move files to frontend

frontend/src/utils/css.js

@@ -0,0 +1,28 @@
+export default function getRule (rules) {
+  for (let i = 0; i < rules.length; i++) {
+    rules[i] = rules[i].toLowerCase()
+  }
+
+  let result = null
+  let find = Array.prototype.find
+
+  find.call(document.styleSheets, styleSheet => {
+    result = find.call(styleSheet.cssRules, cssRule => {
+      let found = false
+
+      if (cssRule instanceof window.CSSStyleRule) {
+        for (let i = 0; i < rules.length; i++) {
+          if (cssRule.selectorText.toLowerCase() === rules[i]) {
+            found = true
+          }
+        }
+      }
+
+      return found
+    })
+
+    return result != null
+  })
+
+  return result
+}