diff --git a/05_CSS_advanced-second/demos/scss/yarn.lock b/05_CSS_advanced-second/demos/scss/yarn.lock
index d691c0e..ec5fac3 100644
--- a/05_CSS_advanced-second/demos/scss/yarn.lock
+++ b/05_CSS_advanced-second/demos/scss/yarn.lock
@@ -1963,7 +1963,7 @@ debug@2.6.9, debug@^2.2.0, debug@^2.3.3:
   dependencies:
     ms "2.0.0"
 
-debug@^3.0.0, debug@^3.1.0, debug@^3.1.1, debug@^3.2.5, debug@^3.2.6:
+debug@^3.0.0, debug@^3.1.0, debug@^3.1.1, debug@^3.2.5:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
   integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
@@ -2006,11 +2006,6 @@ deep-equal@^1.0.1:
     object-keys "^1.1.1"
     regexp.prototype.flags "^1.2.0"
 
-deep-extend@^0.6.0:
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.6.0.tgz#c4fa7c95404a17a9c3e8ca7e1537312b736330ac"
-  integrity sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==
-
 default-gateway@^2.6.0:
   version "2.7.2"
   resolved "https://registry.yarnpkg.com/default-gateway/-/default-gateway-2.7.2.tgz#b7ef339e5e024b045467af403d50348db4642d0f"
@@ -2093,11 +2088,6 @@ detect-file@^1.0.0:
   resolved "https://registry.yarnpkg.com/detect-file/-/detect-file-1.0.0.tgz#f0d66d03672a825cb1b73bdb3fe62310c8e552b7"
   integrity sha1-8NZtA2cqglyxtzvbP+YjEMjlUrc=
 
-detect-libc@^1.0.2:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
-  integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
-
 detect-node@^2.0.4:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/detect-node/-/detect-node-2.0.4.tgz#014ee8f8f669c5c58023da64b8179c083a28c46c"
@@ -2118,9 +2108,9 @@ dns-equal@^1.0.0:
   integrity sha1-s55/HabrCnW6nBcySzR1PEfgZU0=
 
 dns-packet@^1.3.1:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/dns-packet/-/dns-packet-1.3.1.tgz#12aa426981075be500b910eedcd0b47dd7deda5a"
-  integrity sha512-0UxfQkMhYAUaZI+xrNZOz/as5KgDU0M/fQ9b6SpkyLbk3GEswDi6PADJVaYJradtRVsRIlF1zLyOodbcTCDzUg==
+  version "1.3.4"
+  resolved "https://registry.yarnpkg.com/dns-packet/-/dns-packet-1.3.4.tgz#e3455065824a2507ba886c55a89963bb107dec6f"
+  integrity sha512-BQ6F4vycLXBvdrJZ6S3gZewt6rcrks9KBgM9vrhW+knGRqc8uEdT7fuCwloc7nny5xNoMJ17HGH0R/6fpo8ECA==
   dependencies:
     ip "^1.1.0"
     safe-buffer "^5.0.1"
@@ -2663,13 +2653,6 @@ from2@^2.1.0:
     inherits "^2.0.1"
     readable-stream "^2.0.0"
 
-fs-minipass@^1.2.5:
-  version "1.2.7"
-  resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.7.tgz#ccff8570841e7fe4265693da88936c55aed7f7c7"
-  integrity sha512-GWSSJGFy4e9GUeCcbIkED+bgAoFyj7XF1mV8rma3QW4NIqX9Kyx79N/PF61H5udOV3aY1IaMLs6pGbH71nlCTA==
-  dependencies:
-    minipass "^2.6.0"
-
 fs-write-stream-atomic@^1.0.8:
   version "1.0.10"
   resolved "https://registry.yarnpkg.com/fs-write-stream-atomic/-/fs-write-stream-atomic-1.0.10.tgz#b47df53493ef911df75731e70a9ded0189db40c9"
@@ -3106,7 +3089,7 @@ https-browserify@^1.0.0:
   resolved "https://registry.yarnpkg.com/https-browserify/-/https-browserify-1.0.0.tgz#ec06c10e0a34c0f2faf199f7fd7fc78fffd03c73"
   integrity sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM=
 
-iconv-lite@0.4.24, iconv-lite@^0.4.4:
+iconv-lite@0.4.24:
   version "0.4.24"
   resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.24.tgz#2022b4b25fbddc21d2f524974a474aafe733908b"
   integrity sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==
@@ -3130,13 +3113,6 @@ iferr@^0.1.5:
   resolved "https://registry.yarnpkg.com/iferr/-/iferr-0.1.5.tgz#c60eed69e6d8fdb6b3104a1fcbca1c192dc5b501"
   integrity sha1-xg7taebY/bazEEofy8ocGS3FtQE=
 
-ignore-walk@^3.0.1:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/ignore-walk/-/ignore-walk-3.0.3.tgz#017e2447184bfeade7c238e4aefdd1e8f95b1e37"
-  integrity sha512-m7o6xuOaT1aqheYHKf8W6J5pYH85ZI9w077erOzLje3JsB1gkafkAhHHY19dqjulgIZHFm32Cp5uNZgcQqdJKw==
-  dependencies:
-    minimatch "^3.0.4"
-
 import-cwd@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/import-cwd/-/import-cwd-2.1.0.tgz#aa6cf36e722761285cb371ec6519f53e2435b0a9"
@@ -3217,7 +3193,7 @@ inherits@2.0.3:
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
   integrity sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=
 
-ini@^1.3.4, ini@~1.3.0:
+ini@^1.3.4:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
   integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
@@ -3981,21 +3957,6 @@ minimist@^1.1.3, minimist@^1.2.0, minimist@^1.2.5:
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
   integrity sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==
 
-minipass@^2.6.0, minipass@^2.8.6, minipass@^2.9.0:
-  version "2.9.0"
-  resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.9.0.tgz#e713762e7d3e32fed803115cf93e04bca9fcc9a6"
-  integrity sha512-wxfUjg9WebH+CUDX/CdbRlh5SmfZiy/hpkxaRI16Y9W56Pa75sWgd/rvFilSgrauD9NyFymP/+JFV3KwzIsJeg==
-  dependencies:
-    safe-buffer "^5.1.2"
-    yallist "^3.0.0"
-
-minizlib@^1.2.1:
-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.3.3.tgz#2290de96818a34c29551c8a8d301216bd65a861d"
-  integrity sha512-6ZYMOEnmVsdCeTJVE0W9ZD+pVnE8h9Hma/iOwwRDsdQoePpoX56/8B6z3P9VNwppJuBKNRuFDRNRqRWexT9G9Q==
-  dependencies:
-    minipass "^2.9.0"
-
 mississippi@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/mississippi/-/mississippi-3.0.0.tgz#ea0a3291f97e0b5e8776b363d5f0a12d94c67022"
@@ -4089,15 +4050,6 @@ nanomatch@^1.2.9:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
-needle@^2.2.1:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/needle/-/needle-2.3.3.tgz#a041ad1d04a871b0ebb666f40baaf1fb47867117"
-  integrity sha512-EkY0GeSq87rWp1hoq/sH/wnTWgFVhYlnIkbJ0YJFfRgEFlz2RraCjBpFQ+vrEgEdp0ThfyHADmkChEhcb7PKyw==
-  dependencies:
-    debug "^3.2.6"
-    iconv-lite "^0.4.4"
-    sax "^1.2.4"
-
 negotiator@0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
@@ -4172,22 +4124,6 @@ node-libs-browser@^2.0.0:
     util "^0.11.0"
     vm-browserify "^1.0.1"
 
-node-pre-gyp@*:
-  version "0.14.0"
-  resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.14.0.tgz#9a0596533b877289bcad4e143982ca3d904ddc83"
-  integrity sha512-+CvDC7ZttU/sSt9rFjix/P05iS43qHCOOGzcr3Ry99bXG7VX953+vFyEuph/tfqoYu8dttBkE86JSKBO2OzcxA==
-  dependencies:
-    detect-libc "^1.0.2"
-    mkdirp "^0.5.1"
-    needle "^2.2.1"
-    nopt "^4.0.1"
-    npm-packlist "^1.1.6"
-    npmlog "^4.0.2"
-    rc "^1.2.7"
-    rimraf "^2.6.1"
-    semver "^5.3.0"
-    tar "^4.4.2"
-
 node-releases@^1.1.52:
   version "1.1.52"
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.52.tgz#bcffee3e0a758e92e44ecfaecd0a47554b0bcba9"
@@ -4225,14 +4161,6 @@ node-sass@4.13.1:
   dependencies:
     abbrev "1"
 
-nopt@^4.0.1:
-  version "4.0.3"
-  resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.3.tgz#a375cad9d02fd921278d954c2254d5aa57e15e48"
-  integrity sha512-CvaGwVMztSMJLOeXPrez7fyfObdZqNUK1cPAEzLHrTybIua9pMdmmPR5YwtfNftIOMv3DPUhFaxsZMNTQO20Kg==
-  dependencies:
-    abbrev "1"
-    osenv "^0.1.4"
-
 normalize-package-data@^2.3.2, normalize-package-data@^2.3.4:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
@@ -4275,27 +4203,6 @@ normalize-url@^3.0.0:
   resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-3.3.0.tgz#b2e1c4dc4f7c6d57743df733a4f5978d18650559"
   integrity sha512-U+JJi7duF1o+u2pynbp2zXDW2/PADgC30f0GsHZtRh+HOcXHnw137TrNlyxxRvWW5fjKd3bcLHPxofWuCjaeZg==
 
-npm-bundled@^1.0.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/npm-bundled/-/npm-bundled-1.1.1.tgz#1edd570865a94cdb1bc8220775e29466c9fb234b"
-  integrity sha512-gqkfgGePhTpAEgUsGEgcq1rqPXA+tv/aVBlgEzfXwA1yiUJF7xtEt3CtVwOjNYQOVknDk0F20w58Fnm3EtG0fA==
-  dependencies:
-    npm-normalize-package-bin "^1.0.1"
-
-npm-normalize-package-bin@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/npm-normalize-package-bin/-/npm-normalize-package-bin-1.0.1.tgz#6e79a41f23fd235c0623218228da7d9c23b8f6e2"
-  integrity sha512-EPfafl6JL5/rU+ot6P3gRSCpPDW5VmIzX959Ob1+ySFUuuYHWHekXpwdUZcKP5C+DS4GEtdJluwBjnsNDl+fSA==
-
-npm-packlist@^1.1.6:
-  version "1.4.8"
-  resolved "https://registry.yarnpkg.com/npm-packlist/-/npm-packlist-1.4.8.tgz#56ee6cc135b9f98ad3d51c1c95da22bbb9b2ef3e"
-  integrity sha512-5+AZgwru5IevF5ZdnFglB5wNlHG1AOOuw28WhUq8/8emhBmLv6jX5by4WJCh7lW0uSYZYS6DXqIsyZVIXRZU9A==
-  dependencies:
-    ignore-walk "^3.0.1"
-    npm-bundled "^1.0.1"
-    npm-normalize-package-bin "^1.0.1"
-
 npm-run-path@^2.0.0:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
@@ -4303,7 +4210,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-"npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.0, npmlog@^4.0.2:
+"npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.0:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   integrity sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==
@@ -4475,7 +4382,7 @@ os-tmpdir@^1.0.0:
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
   integrity sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=
 
-osenv@0, osenv@^0.1.4:
+osenv@0:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
   integrity sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==
@@ -5228,16 +5135,6 @@ raw-body@2.4.0:
     iconv-lite "0.4.24"
     unpipe "1.0.0"
 
-rc@^1.2.7:
-  version "1.2.8"
-  resolved "https://registry.yarnpkg.com/rc/-/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
-  integrity sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==
-  dependencies:
-    deep-extend "^0.6.0"
-    ini "~1.3.0"
-    minimist "^1.2.0"
-    strip-json-comments "~2.0.1"
-
 read-pkg-up@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-1.0.1.tgz#9d63c13276c065918d57f002a57f40a1b643fb02"
@@ -5485,7 +5382,7 @@ rgba-regex@^1.0.0:
   resolved "https://registry.yarnpkg.com/rgba-regex/-/rgba-regex-1.0.0.tgz#43374e2e2ca0968b0ef1523460b7d730ff22eeb3"
   integrity sha1-QzdOLiyglosO8VI0YLfXMP8i7rM=
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.3:
+rimraf@2, rimraf@^2.2.8, rimraf@^2.5.4, rimraf@^2.6.3:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
   integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
@@ -5513,9 +5410,9 @@ safe-buffer@5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
 
 safe-buffer@>=5.1.0, safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.0.tgz#b74daec49b1148f88c64b68d49b1e815c1f2f519"
-  integrity sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
+  integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
 
 safe-regex@^1.1.0:
   version "1.1.0"
@@ -5550,7 +5447,7 @@ sass-loader@8.0.2:
     schema-utils "^2.6.1"
     semver "^6.3.0"
 
-sax@^1.2.4, sax@~1.2.4:
+sax@~1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
   integrity sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==
@@ -6071,11 +5968,6 @@ strip-indent@^1.0.1:
   dependencies:
     get-stdin "^4.0.1"
 
-strip-json-comments@~2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
-  integrity sha1-PFMZQukIwml8DsNEhYwobHygpgo=
-
 style-loader@1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/style-loader/-/style-loader-1.1.3.tgz#9e826e69c683c4d9bf9db924f85e9abb30d5e200"
@@ -6145,19 +6037,6 @@ tar@^2.0.0:
     fstream "^1.0.12"
     inherits "2"
 
-tar@^4.4.2:
-  version "4.4.13"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.13.tgz#43b364bc52888d555298637b10d60790254ab525"
-  integrity sha512-w2VwSrBoHa5BsSyH+KxEqeQBAllHhccyMFVHtGtdMpF4W7IRWfZjFiQceJPChOeTsSDVUpER2T8FA93pr0L+QA==
-  dependencies:
-    chownr "^1.1.1"
-    fs-minipass "^1.2.5"
-    minipass "^2.8.6"
-    minizlib "^1.2.1"
-    mkdirp "^0.5.0"
-    safe-buffer "^5.1.2"
-    yallist "^3.0.3"
-
 terser-webpack-plugin@^1.1.0:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-1.4.3.tgz#5ecaf2dbdc5fb99745fd06791f46fc9ddb1c9a7c"
@@ -6739,7 +6618,7 @@ yallist@^2.1.2:
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
   integrity sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=
 
-yallist@^3.0.0, yallist@^3.0.2, yallist@^3.0.3:
+yallist@^3.0.2:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"
   integrity sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==