Index: frontend/node_modules/postcss-browser-comments/index.mjs
===================================================================
--- frontend/node_modules/postcss-browser-comments/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/postcss-browser-comments/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,86 @@
+import browserslist from 'browserslist';
+
+const plugin = opts => {
+  return {
+    postcssPlugin: 'postcss-browser-comments',
+
+    Once(root) {
+      // client browserslist
+      const clientBrowserList = browserslist(Object(opts).browsers || null, {
+        path: root.source && root.source.input && root.source.input.file
+      }); // root children references
+
+      const references = root.nodes.slice(0); // for each child node of the root children references
+
+      for (const node of references) {
+        // if the node is a comment browser comment node
+        if (isBrowserCommentNode(node)) {
+          // rule following the browser comment
+          const rule = node.next(); // browser data
+
+          const browserdata = getBrowserData(node.text);
+
+          if (browserdata.isNumbered) {
+            rule.nodes.filter(isBrowserReferenceCommentNode).map(comment => {
+              const browserdataIndex = parseFloat(comment.text) - 1;
+              const browserslistPart = browserdata.browserslist[browserdataIndex]; // whether to remove the rule if the comment browserslist does not match the client browserslist
+
+              const removeRule = !clientBrowserList.some(clientBrowser => browserslist(browserslistPart).some(commentBrowser => commentBrowser === clientBrowser)); // conditionally remove the declaration and reference comment
+
+              if (removeRule) {
+                comment.prev().remove();
+                comment.remove();
+              }
+            }); // conditionally remove the empty rule and comment
+
+            if (!rule.nodes.length) {
+              rule.remove();
+              node.remove();
+            }
+          } else {
+            // whether to remove the rule if the comment browserslist does not match the client browserslist
+            const removeRule = !clientBrowserList.some(clientBrowser => browserslist(browserdata.browserslist).some(commentBrowser => commentBrowser === clientBrowser)); // conditionally remove the rule and comment
+
+            if (removeRule) {
+              rule.remove();
+              node.remove();
+            }
+          }
+        }
+      }
+    }
+
+  };
+};
+
+plugin.postcss = true;
+
+const isBrowserCommentNode = node => node.type === 'comment' && isBrowserCommentNodeRegExp.test(node.text) && node.next().type === 'rule';
+
+const isBrowserCommentNodeRegExp = /^\*\n * /; // returns whether a node is a browser reference comment
+
+const isBrowserReferenceCommentNode = node => node.type === 'comment' && isBrowserReferenceCommentNodeRegExp.test(node.text);
+
+const isBrowserReferenceCommentNodeRegExp = /^\d+$/; // returns browser data from comment text
+
+const getBrowserData = text => {
+  const browserDataNumbered = text.match(browserDataMutliRegExp);
+  const isNumbered = Boolean(browserDataNumbered);
+  return {
+    browserslist: isNumbered ? browserDataNumbered.map(browserslistPart => getBrowsersList(browserslistPart.replace(browserDataNumberedNewlineRegExp, '$1'))) : getBrowsersList(text.replace(browserDataNewlineRegExp, '')),
+    isNumbered
+  };
+};
+
+const browserDataMutliRegExp = /(\n \* \d+\. (?:[^\n]+|\n \* {4,})+)/g;
+const browserDataNewlineRegExp = /^\*\n \* ?|\n \*/g;
+const browserDataNumberedNewlineRegExp = /\n \* (?:( )\s*)?/g; // returns a browserlist from comment text
+
+const getBrowsersList = text => text.split(getBrowsersListInSplitRegExp).slice(1).map(part => part.split(getBrowsersListAndSplitRegExp).filter(part2 => part2)).reduce((acc, val) => acc.concat(val), []).map(part => part.replace(getBrowsersListQueryRegExp, ($0, browser, query) => browser === 'all' ? '> 0%' : `${browser}${query ? /^((?:\d*\.)?\d+)-$/.test(query) ? ` <= ${query.slice(0, -1)}` : ` ${query}` : ' > 0'}`).toLowerCase());
+
+const getBrowsersListInSplitRegExp = /\s+in\s+/;
+const getBrowsersListAndSplitRegExp = /(?: and|, and|,)/;
+const getBrowsersListQueryRegExp = /^\s*(\w+)(?: ((?:(?:\d*\.)?\d+-)?(?:\d*\.)?\d+[+-]?))?.*$/;
+
+export default plugin;
+//# sourceMappingURL=index.mjs.map