diff --git a/package.json b/package.json
index f6766a5da..6d9aa2b62 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,7 @@
     "markmap-lib": "0.11.6",
     "markmap-view": "0.2.6",
     "mermaid": "8.10.1",
-    "node-sass": "4.14.1",
+    "node-sass": "6.0.0",
     "react": "17.0.2",
     "react-bootstrap": "1.6.0",
     "react-bootstrap-typeahead": "5.1.4",
diff --git a/yarn.lock b/yarn.lock
index 18b8a1ba2..c4da7099b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3654,13 +3654,6 @@ blob-util@^2.0.2:
   resolved "https://registry.yarnpkg.com/blob-util/-/blob-util-2.0.2.tgz#3b4e3c281111bb7f11128518006cdc60b403a1eb"
   integrity sha512-T7JQa+zsXXEa6/8ZhHcQEW1UFfVM49Ts65uBkFL6fz2QmrElqmbajIDJvuA0tEhRe5eIjpV9ZF+0RfZR9voJFQ==
 
-block-stream@*:
-  version "0.0.9"
-  resolved "https://registry.yarnpkg.com/block-stream/-/block-stream-0.0.9.tgz#13ebfe778a03205cfe03751481ebb4b3300c126a"
-  integrity sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=
-  dependencies:
-    inherits "~2.0.0"
-
 bluebird@^3.5.5, bluebird@^3.7.1, bluebird@^3.7.2:
   version "3.7.2"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.7.2.tgz#9f229c15be272454ffa973ace0dbee79a1b0c36f"
@@ -4687,7 +4680,7 @@ cross-fetch@3.1.4:
   dependencies:
     node-fetch "2.6.1"
 
-cross-spawn@7.0.3, cross-spawn@^7.0.0, cross-spawn@^7.0.1, cross-spawn@^7.0.2:
+cross-spawn@7.0.3, cross-spawn@^7.0.0, cross-spawn@^7.0.1, cross-spawn@^7.0.2, cross-spawn@^7.0.3:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
@@ -4696,14 +4689,6 @@ cross-spawn@7.0.3, cross-spawn@^7.0.0, cross-spawn@^7.0.1, cross-spawn@^7.0.2:
     shebang-command "^2.0.0"
     which "^2.0.1"
 
-cross-spawn@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-3.0.1.tgz#1256037ecb9f0c5f79e3d6ef135e30770184b982"
-  integrity sha1-ElYDfsufDF9549bvE14wdwGEuYI=
-  dependencies:
-    lru-cache "^4.0.1"
-    which "^1.2.9"
-
 cross-spawn@^6.0.0:
   version "6.0.5"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
@@ -6131,6 +6116,11 @@ entity-decode@^2.0.2:
   dependencies:
     he "^1.1.1"
 
+env-paths@^2.2.0:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/env-paths/-/env-paths-2.2.1.tgz#420399d416ce1fbe9bc0a07c62fa68d67fd0f8f2"
+  integrity sha512-+h1lkLKhZMTYjog1VEpJNG7NZJWcuc2DDk/qsqSTRRCOXiLjeQ1d1/udrUGhqMxUgAlwKNZ0cf2uqan5GLuS2A==
+
 errno@^0.1.3, errno@~0.1.7:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/errno/-/errno-0.1.8.tgz#8bb3e9c7d463be4976ff888f76b4809ebc2e811f"
@@ -7125,16 +7115,6 @@ fsevents@^2.1.2, fsevents@^2.1.3, fsevents@~2.3.1:
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
   integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
 
-fstream@^1.0.0, fstream@^1.0.12:
-  version "1.0.12"
-  resolved "https://registry.yarnpkg.com/fstream/-/fstream-1.0.12.tgz#4e8ba8ee2d48be4f7d0de505455548eae5932045"
-  integrity sha512-WvJ193OHa0GHPEL+AycEJgxvBEwyfRkN1vhjca23OaPVMCaLCXTd5qAu82AjTcgP1UJmytkOKb63Ypde7raDIg==
-  dependencies:
-    graceful-fs "^4.1.2"
-    inherits "~2.0.0"
-    mkdirp ">=0.5 0"
-    rimraf "2"
-
 function-bind@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
@@ -7353,7 +7333,7 @@ good-listener@^1.2.2:
   dependencies:
     delegate "^3.1.2"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.4:
+graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.3, graceful-fs@^4.2.4:
   version "4.2.6"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.6.tgz#ff040b2b0853b23c3d31027523706f1885d76bee"
   integrity sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ==
@@ -7869,11 +7849,6 @@ imurmurhash@^0.1.4:
   resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
   integrity sha1-khi5srkoojixPcT7a21XbyMUU+o=
 
-in-publish@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/in-publish/-/in-publish-2.0.1.tgz#948b1a535c8030561cea522f73f78f4be357e00c"
-  integrity sha512-oDM0kUSNFC31ShNxHKUyfZKy8ZeXZBWMjMdZHKLOk13uvT27VTL/QzRGfRUcevJhpkZAvlhPYuXkF7eNWrtyxQ==
-
 indent-string@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/indent-string/-/indent-string-2.1.0.tgz#8e2d48348742121b4a8218b7a137e9a52049dc80"
@@ -7909,7 +7884,7 @@ inflight@^1.0.4:
     once "^1.3.0"
     wrappy "1"
 
-inherits@2, inherits@2.0.4, inherits@^2.0.1, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.0, inherits@~2.0.1, inherits@~2.0.3:
+inherits@2, inherits@2.0.4, inherits@^2.0.1, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.1, inherits@~2.0.3:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
   integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
@@ -9398,14 +9373,6 @@ lower-case@^2.0.2:
   dependencies:
     tslib "^2.0.3"
 
-lru-cache@^4.0.1:
-  version "4.1.5"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.5.tgz#8bbe50ea85bed59bc9e33dcab8235ee9bcf443cd"
-  integrity sha512-sWZlbEP2OsHNkXrMl5GYk/jKk70MBng6UU4YI/qGDYbgf6YbP4EvmqISbXCoJiRKs+1bSpFHVgQxvJ17F2li5g==
-  dependencies:
-    pseudomap "^1.0.2"
-    yallist "^2.1.2"
-
 lru-cache@^5.1.1:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-5.1.1.tgz#1da27e6710271947695daf6848e847f01d84b920"
@@ -9895,7 +9862,7 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-"mkdirp@>=0.5 0", mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@^0.5.3, mkdirp@^0.5.4, mkdirp@^0.5.5, mkdirp@~0.5.1:
+mkdirp@^0.5.1, mkdirp@^0.5.3, mkdirp@^0.5.4, mkdirp@^0.5.5, mkdirp@~0.5.1:
   version "0.5.5"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.5.tgz#d91cefd62d1436ca0f41620e251288d420099def"
   integrity sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==
@@ -10055,23 +10022,21 @@ node-forge@^0.10.0:
   resolved "https://registry.yarnpkg.com/node-forge/-/node-forge-0.10.0.tgz#32dea2afb3e9926f02ee5ce8794902691a676bf3"
   integrity sha512-PPmu8eEeG9saEUvI97fm4OYxXVB6bFvyNTyiUOBichBpFG8A1Ljw3bY62+5oOjDEMHRnd0Y7HQ+x7uzxOzC6JA==
 
-node-gyp@^3.8.0:
-  version "3.8.0"
-  resolved "https://registry.yarnpkg.com/node-gyp/-/node-gyp-3.8.0.tgz#540304261c330e80d0d5edce253a68cb3964218c"
-  integrity sha512-3g8lYefrRRzvGeSowdJKAKyks8oUpLEd/DyPV4eMhVlhJ0aNaZqIrNUIPuEWWTAoPqyFkfGrM67MC69baqn6vA==
+node-gyp@^7.1.0:
+  version "7.1.2"
+  resolved "https://registry.yarnpkg.com/node-gyp/-/node-gyp-7.1.2.tgz#21a810aebb187120251c3bcec979af1587b188ae"
+  integrity sha512-CbpcIo7C3eMu3dL1c3d0xw449fHIGALIJsRP4DDPHpyiW8vcriNY7ubh9TE4zEKfSxscY7PjeFnshE7h75ynjQ==
   dependencies:
-    fstream "^1.0.0"
-    glob "^7.0.3"
-    graceful-fs "^4.1.2"
-    mkdirp "^0.5.0"
-    nopt "2 || 3"
-    npmlog "0 || 1 || 2 || 3 || 4"
-    osenv "0"
-    request "^2.87.0"
-    rimraf "2"
-    semver "~5.3.0"
-    tar "^2.0.0"
-    which "1"
+    env-paths "^2.2.0"
+    glob "^7.1.4"
+    graceful-fs "^4.2.3"
+    nopt "^5.0.0"
+    npmlog "^4.1.2"
+    request "^2.88.2"
+    rimraf "^3.0.2"
+    semver "^7.3.2"
+    tar "^6.0.2"
+    which "^2.0.2"
 
 node-int64@^0.4.0:
   version "0.4.0"
@@ -10129,33 +10094,32 @@ node-releases@^1.1.61, node-releases@^1.1.71:
   resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.72.tgz#14802ab6b1039a79a0c7d662b610a5bbd76eacbe"
   integrity sha512-LLUo+PpH3dU6XizX3iVoubUNheF/owjXCZZ5yACDxNnPtgFuludV1ZL3ayK1kVep42Rmm0+R9/Y60NQbZ2bifw==
 
-node-sass@4.14.1:
-  version "4.14.1"
-  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.14.1.tgz#99c87ec2efb7047ed638fb4c9db7f3a42e2217b5"
-  integrity sha512-sjCuOlvGyCJS40R8BscF5vhVlQjNN069NtQ1gSxyK1u9iqvn6tf7O1R4GNowVZfiZUCRt5MmMs1xd+4V/7Yr0g==
+node-sass@6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-6.0.0.tgz#f30da3e858ad47bfd138bc0e0c6f924ed2f734af"
+  integrity sha512-GDzDmNgWNc9GNzTcSLTi6DU6mzSPupVJoStIi7cF3GjwSE9q1cVakbvAAVSt59vzUjV9JJoSZFKoo9krbjKd2g==
   dependencies:
     async-foreach "^0.1.3"
     chalk "^1.1.1"
-    cross-spawn "^3.0.0"
+    cross-spawn "^7.0.3"
     gaze "^1.0.0"
     get-stdin "^4.0.1"
     glob "^7.0.3"
-    in-publish "^2.0.0"
     lodash "^4.17.15"
     meow "^3.7.0"
     mkdirp "^0.5.1"
     nan "^2.13.2"
-    node-gyp "^3.8.0"
+    node-gyp "^7.1.0"
     npmlog "^4.0.0"
     request "^2.88.0"
     sass-graph "2.2.5"
     stdout-stream "^1.4.0"
     "true-case-path" "^1.0.2"
 
-"nopt@2 || 3":
-  version "3.0.6"
-  resolved "https://registry.yarnpkg.com/nopt/-/nopt-3.0.6.tgz#c6465dbf08abcd4db359317f79ac68a646b28ff9"
-  integrity sha1-xkZdvwirzU2zWTF/eaxopkayj/k=
+nopt@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/nopt/-/nopt-5.0.0.tgz#530942bb58a512fccafe53fe210f13a25355dc88"
+  integrity sha512-Tbj67rffqceeLpcRXrT7vKAN8CwfPeIBgM7E6iBkmKLV7bEMwpGgYLGv0jACUsECaa/vuxP0IjEont6umdMgtQ==
   dependencies:
     abbrev "1"
 
@@ -10215,7 +10179,7 @@ npm-run-path@^4.0.0:
   dependencies:
     path-key "^3.0.0"
 
-"npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.0:
+npmlog@^4.0.0, npmlog@^4.1.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   integrity sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==
@@ -10454,24 +10418,6 @@ os-browserify@^0.3.0:
   resolved "https://registry.yarnpkg.com/os-browserify/-/os-browserify-0.3.0.tgz#854373c7f5c2315914fc9bfc6bd8238fdda1ec27"
   integrity sha1-hUNzx/XCMVkU/Jv8a9gjj92h7Cc=
 
-os-homedir@^1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
-  integrity sha1-/7xJiDNuDoM94MFox+8VISGqf7M=
-
-os-tmpdir@^1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
-  integrity sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=
-
-osenv@0:
-  version "0.1.5"
-  resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
-  integrity sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==
-  dependencies:
-    os-homedir "^1.0.0"
-    os-tmpdir "^1.0.0"
-
 ospath@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/ospath/-/ospath-1.2.2.tgz#1276639774a3f8ef2572f7fe4280e0ea4550c07b"
@@ -11651,11 +11597,6 @@ prr@~1.0.1:
   resolved "https://registry.yarnpkg.com/prr/-/prr-1.0.1.tgz#d3fc114ba06995a45ec6893f484ceb1d78f5f476"
   integrity sha1-0/wRS6BplaRexok/SEzrHXj19HY=
 
-pseudomap@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
-  integrity sha1-8FKijacOYYkX7wqKw0wa5aaChrM=
-
 psl@^1.1.28, psl@^1.1.33:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/psl/-/psl-1.8.0.tgz#9326f8bcfb013adcc005fdff056acce020e51c24"
@@ -12473,7 +12414,7 @@ request-promise-native@^1.0.9:
     stealthy-require "^1.1.1"
     tough-cookie "^2.3.3"
 
-request@^2.87.0, request@^2.88.0, request@^2.88.2:
+request@^2.88.0, request@^2.88.2:
   version "2.88.2"
   resolved "https://registry.yarnpkg.com/request/-/request-2.88.2.tgz#d73c918731cb5a87da047e207234146f664d12b3"
   integrity sha512-MsvtOrfG9ZcrOwAW+Qi+F6HbD0CWXEh9ou77uOb7FM2WPhwT7smM833PzanhJLsgXjN89Ir6V2PczXNnMpwKhw==
@@ -12657,7 +12598,7 @@ 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@^2.5.4, rimraf@^2.6.3:
+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==
@@ -12938,11 +12879,6 @@ semver@^7.2.1, semver@^7.3.2, semver@^7.3.4, semver@^7.3.5:
   dependencies:
     lru-cache "^6.0.0"
 
-semver@~5.3.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"
-  integrity sha1-myzl094C0XxgEq0yaqa00M9U+U8=
-
 send@0.17.1:
   version "0.17.1"
   resolved "https://registry.yarnpkg.com/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"
@@ -13756,15 +13692,6 @@ tapable@^2.2.0:
   resolved "https://registry.yarnpkg.com/tapable/-/tapable-2.2.0.tgz#5c373d281d9c672848213d0e037d1c4165ab426b"
   integrity sha512-FBk4IesMV1rBxX2tfiK8RAmogtWn53puLOQlvO8XuwlgxcYbP4mVPS9Ph4aeamSyyVjOl24aYWAuc8U5kCVwMw==
 
-tar@^2.0.0:
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.2.tgz#0ca8848562c7299b8b446ff6a4d60cdbb23edc40"
-  integrity sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==
-  dependencies:
-    block-stream "*"
-    fstream "^1.0.12"
-    inherits "2"
-
 tar@^6.0.2:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.0.tgz#d1724e9bcc04b977b18d5c573b333a2207229a83"
@@ -15134,7 +15061,7 @@ which-module@^2.0.0:
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
   integrity sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=
 
-which@1, which@^1.2.9, which@^1.3.1:
+which@^1.2.9, which@^1.3.1:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
   integrity sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==
@@ -15414,11 +15341,6 @@ y18n@^5.0.5:
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-5.0.8.tgz#7f4934d0f7ca8c56f95314939ddcd2dd91ce1d55"
   integrity sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==
 
-yallist@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
-  integrity sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=
-
 yallist@^3.0.2:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.1.1.tgz#dbb7daf9bfd8bac9ab45ebf602b8cbad0d5d08fd"