diff --git a/learning-resources-react/package-lock.json b/learning-resources-react/package-lock.json
index 9dbfa1d..9179ca2 100644
--- a/learning-resources-react/package-lock.json
+++ b/learning-resources-react/package-lock.json
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+        "@babel/runtime": "^7.3.1",
+        "hyphenate-style-name": "^1.0.3",
+        "jss": "10.4.0"
+      }
+    },
+    "jss-plugin-default-unit": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-default-unit/-/jss-plugin-default-unit-10.4.0.tgz",
+      "integrity": "sha512-BYJ+Y3RUYiMEgmlcYMLqwbA49DcSWsGgHpVmEEllTC8MK5iJ7++pT9TnKkKBnNZZxTV75ycyFCR5xeLSOzVm4A==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "jss": "10.4.0"
+      }
+    },
+    "jss-plugin-global": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-global/-/jss-plugin-global-10.4.0.tgz",
+      "integrity": "sha512-b8IHMJUmv29cidt3nI4bUI1+Mo5RZE37kqthaFpmxf5K7r2aAegGliAw4hXvA70ca6ckAoXMUl4SN/zxiRcRag==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "jss": "10.4.0"
+      }
+    },
+    "jss-plugin-nested": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-nested/-/jss-plugin-nested-10.4.0.tgz",
+      "integrity": "sha512-cKgpeHIxAP0ygeWh+drpLbrxFiak6zzJ2toVRi/NmHbpkNaLjTLgePmOz5+67ln3qzJiPdXXJB1tbOyYKAP4Pw==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "jss": "10.4.0",
+        "tiny-warning": "^1.0.2"
+      }
+    },
+    "jss-plugin-props-sort": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-props-sort/-/jss-plugin-props-sort-10.4.0.tgz",
+      "integrity": "sha512-j/t0R40/2fp+Nzt6GgHeUFnHVY2kPGF5drUVlgkcwYoHCgtBDOhTTsOfdaQFW6sHWfoQYgnGV4CXdjlPiRrzwA==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "jss": "10.4.0"
+      }
+    },
+    "jss-plugin-rule-value-function": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-rule-value-function/-/jss-plugin-rule-value-function-10.4.0.tgz",
+      "integrity": "sha512-w8504Cdfu66+0SJoLkr6GUQlEb8keHg8ymtJXdVHWh0YvFxDG2l/nS93SI5Gfx0fV29dO6yUugXnKzDFJxrdFQ==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "jss": "10.4.0",
+        "tiny-warning": "^1.0.2"
+      }
+    },
+    "jss-plugin-vendor-prefixer": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/jss-plugin-vendor-prefixer/-/jss-plugin-vendor-prefixer-10.4.0.tgz",
+      "integrity": "sha512-DpF+/a+GU8hMh/948sBGnKSNfKkoHg2p9aRFUmyoyxgKjOeH9n74Ht3Yt8lOgdZsuWNJbPrvaa3U4PXKwxVpTQ==",
+      "requires": {
+        "@babel/runtime": "^7.3.1",
+        "css-vendor": "^2.0.8",
+        "jss": "10.4.0"
+      }
+    },
     "jsx-ast-utils": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/jsx-ast-utils/-/jsx-ast-utils-2.1.0.tgz",
@@ -8851,6 +9181,11 @@
         "ts-pnp": "^1.0.0"
       }
     },
+    "popper.js": {
+      "version": "1.16.1-lts",
+      "resolved": "https://registry.npmjs.org/popper.js/-/popper.js-1.16.1-lts.tgz",
+      "integrity": "sha512-Kjw8nKRl1m+VrSFCoVGPph93W/qrSO7ZkqPpTf7F4bk/sqcfWK019dWBUpE/fBOsOQY1dks/Bmcbfn1heM/IsA=="
+    },
     "portfinder": {
       "version": "1.0.20",
       "resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.20.tgz",
@@ -10122,6 +10457,32 @@
         "workbox-webpack-plugin": "4.2.0"
       }
     },
+    "react-transition-group": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/react-transition-group/-/react-transition-group-4.4.1.tgz",
+      "integrity": "sha512-Djqr7OQ2aPUiYurhPalTrVy9ddmFCCzwhqQmtN+J3+3DzLO209Fdr70QrN8Z3DsglWql6iY1lDWAfpFiBtuKGw==",
+      "requires": {
+        "@babel/runtime": "^7.5.5",
+        "dom-helpers": "^5.0.1",
+        "loose-envify": "^1.4.0",
+        "prop-types": "^15.6.2"
+      },
+      "dependencies": {
+        "@babel/runtime": {
+          "version": "7.11.2",
+          "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.11.2.tgz",
+          "integrity": "sha512-TeWkU52so0mPtDcaCTxNBI/IHiz0pZgr8VEFqXFtZWpYD08ZB6FaSwVAS8MKRQAP3bYKiVjwysOJgMFY28o6Tw==",
+          "requires": {
+            "regenerator-runtime": "^0.13.4"
+          }
+        },
+        "regenerator-runtime": {
+          "version": "0.13.7",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.7.tgz",
+          "integrity": "sha512-a54FxoJDIr27pgf7IgeQGxmqUNYrcV338lf/6gH456HZ/PhX+5BcwHXG9ajESmwe6WRO0tAzRUrRmNONWgkrew=="
+        }
+      }
+    },
     "read-pkg": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
@@ -11553,6 +11914,11 @@
       "resolved": "https://registry.npmjs.org/timsort/-/timsort-0.3.0.tgz",
       "integrity": "sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q="
     },
+    "tiny-warning": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-warning/-/tiny-warning-1.0.3.tgz",
+      "integrity": "sha512-lBN9zLN/oAf68o3zNXYrdCt1kP8WsiGW8Oo2ka41b2IM5JL/S1CTyX1rW0mb/zSuJun0ZUrDxx4sqvYS2FWzPA=="
+    },
     "tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
diff --git a/learning-resources-react/yarn.lock b/learning-resources-react/yarn.lock
index 38721ea..c65d21d 100644
--- a/learning-resources-react/yarn.lock
+++ b/learning-resources-react/yarn.lock
@@ -3808,10 +3808,10 @@ etag@~1.8.1:
   resolved "https://registry.yarnpkg.com/etag/-/etag-1.8.1.tgz#41ae2eeb65efa62268aebfea83ac7d79299b0887"
   integrity sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=
 
-eventemitter3@^3.0.0:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-3.1.2.tgz#2d3d48f9c346698fce83a85d7d664e98535df6e7"
-  integrity sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q==
+eventemitter3@^4.0.0:
+  version "4.0.7"
+  resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-4.0.7.tgz#2de9b68f6528d5644ef5c59526a1b4a07306169f"
+  integrity sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==
 
 events@^3.0.0:
   version "3.0.0"
@@ -4141,11 +4141,9 @@ flush-write-stream@^1.0.0:
     readable-stream "^2.3.6"
 
 follow-redirects@^1.0.0:
-  version "1.7.0"
-  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.7.0.tgz#489ebc198dc0e7f64167bd23b03c4c19b5784c76"
-  integrity sha512-m/pZQy4Gj287eNy94nivy5wchN3Kp+Q5WgUPNy5lJSZ3sgkVKSYV/ZChMAQVIgx1SqfZ2zBZtPA2YlXIWxxJOQ==
-  dependencies:
-    debug "^3.2.6"
+  version "1.13.0"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.13.0.tgz#b42e8d93a2a7eea5ed88633676d6597bc8e384db"
+  integrity sha512-aq6gF1BEKje4a9i9+5jimNFIpq4Q1WiwBToeRK5NvZBd/TRsmW8BsJfOEGkr76TbOyPVD3OVDN910EcUNtRYEA==
 
 for-in@^0.1.3:
   version "0.1.8"
@@ -4701,11 +4699,11 @@ http-proxy-middleware@^0.19.1:
     micromatch "^3.1.10"
 
 http-proxy@^1.17.0:
-  version "1.17.0"
-  resolved "https://registry.yarnpkg.com/http-proxy/-/http-proxy-1.17.0.tgz#7ad38494658f84605e2f6db4436df410f4e5be9a"
-  integrity sha512-Taqn+3nNvYRfJ3bGvKfBSRwy1v6eePlm3oc/aWVxZp57DQr5Eq3xhKJi7Z4hZpS8PC3H4qI+Yly5EmFacGuA/g==
+  version "1.18.1"
+  resolved "https://registry.yarnpkg.com/http-proxy/-/http-proxy-1.18.1.tgz#401541f0534884bbf95260334e72f88ee3976549"
+  integrity sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==
   dependencies:
-    eventemitter3 "^3.0.0"
+    eventemitter3 "^4.0.0"
     follow-redirects "^1.0.0"
     requires-port "^1.0.0"