diff --git a/package-lock.json b/package-lock.json
index 1134e81e..8642ee26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,7 +26,7 @@
         "colorspaces": "0.1.4",
         "cookie-parser": "^1.0.1",
         "cookie-session": "^1.0.1",
-        "css-loader": "^3.4.0",
+        "css-loader": "^6.8.1",
         "csurf": "^1.1.0",
         "d3": "~3",
         "d3-tip": "git://github.com/sorawee/d3-tip.git",
@@ -6017,7 +6017,8 @@
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+      "integrity": "sha512-YSBPTLTVm2e2OoQIDYx8HaeWJ5tTToLH67kXR7zYNGupXMEHa2++G8k+DczX2cFVgalypqtyZIcU19AFcmOpmg==",
+      "peer": true
     },
     "node_modules/@types/node": {
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@@ -7862,6 +7863,7 @@
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+      "dev": true,
       "engines": {
         "node": ">=6"
       }
@@ -8764,36 +8766,63 @@
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-      "integrity": "sha512-M5lSukoWi1If8dhQAUCvj4H8vUt3vOnwbQBH9DdTm/s4Ym2B/3dPMtYZeJmq7Q3S3Pa+I94DcZ7pc9bP14cWIQ==",
+      "version": "6.8.1",
+      "resolved": "https://registry.npmjs.org/css-loader/-/css-loader-6.8.1.tgz",
+      "integrity": "sha512-xDAXtEVGlD0gJ07iclwWVkLoZOpEvAWaSyf6W18S2pOC//K8+qUDIx8IIT3D+HjnmkJPQeesOPv5aiUaJsCM2g==",
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-        "icss-utils": "^4.1.1",
-        "loader-utils": "^1.2.3",
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-        "postcss-value-parser": "^4.1.0",
-        "schema-utils": "^2.7.0",
-        "semver": "^6.3.0"
+        "icss-utils": "^5.1.0",
+        "postcss": "^8.4.21",
+        "postcss-modules-extract-imports": "^3.0.0",
+        "postcss-modules-local-by-default": "^4.0.3",
+        "postcss-modules-scope": "^3.0.0",
+        "postcss-modules-values": "^4.0.0",
+        "postcss-value-parser": "^4.2.0",
+        "semver": "^7.3.8"
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+        "node": ">= 12.13.0"
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         "type": "opencollective",
         "url": "https://opencollective.com/webpack"
       },
       "peerDependencies": {
-        "webpack": "^4.0.0 || ^5.0.0"
+        "webpack": "^5.0.0"
+      }
+    },
+    "node_modules/css-loader/node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
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+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
       }
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+    "node_modules/css-loader/node_modules/semver": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
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+    "node_modules/css-loader/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+    },
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+      "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-3.0.0.tgz",
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         "cssesc": "bin/cssesc"
@@ -11523,13 +11552,14 @@
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-        "postcss": "^7.0.14"
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+      "resolved": "https://registry.npmjs.org/icss-utils/-/icss-utils-5.1.0.tgz",
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-        "node": ">= 6"
+        "node": "^10 || ^12 || >= 14"
+      },
+      "peerDependencies": {
+        "postcss": "^8.1.0"
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@@ -13908,6 +13938,11 @@
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+    "node_modules/picocolors": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.0.tgz",
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+    },
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@@ -14023,66 +14058,91 @@
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-      "integrity": "sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/postcss/"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/postcss"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
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       "dependencies": {
-        "chalk": "^2.4.2",
-        "source-map": "^0.6.1",
-        "supports-color": "^6.1.0"
+        "nanoid": "^3.3.6",
+        "picocolors": "^1.0.0",
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-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/postcss/"
+        "node": "^10 || ^12 || >=14"
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+      "integrity": "sha512-bdHleFnP3kZ4NYDhuGlVK+CMrQ/pqUm8bx/oGL93K6gVwiclvX5x0n76fYMKuIGKzlABOy13zsvqjb0f92TEXw==",
       "engines": {
-        "node": ">= 6"
+        "node": "^10 || ^12 || >= 14"
+      },
+      "peerDependencies": {
+        "postcss": "^8.1.0"
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     "node_modules/postcss-modules-local-by-default": {
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+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/postcss-modules-local-by-default/-/postcss-modules-local-by-default-4.0.3.tgz",
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       "dependencies": {
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-        "postcss": "^7.0.32",
+        "icss-utils": "^5.0.0",
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         "postcss-value-parser": "^4.1.0"
       },
       "engines": {
-        "node": ">= 6"
+        "node": "^10 || ^12 || >= 14"
+      },
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     "node_modules/postcss-modules-scope": {
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-        "postcss": "^7.0.6",
-        "postcss-selector-parser": "^6.0.0"
+        "postcss-selector-parser": "^6.0.4"
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-        "node": ">= 6"
+        "node": "^10 || ^12 || >= 14"
+      },
+      "peerDependencies": {
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-        "postcss": "^7.0.6"
+        "icss-utils": "^5.0.0"
+      },
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+        "node": "^10 || ^12 || >= 14"
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@@ -14092,63 +14152,25 @@
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+      "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz",
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-      "dependencies": {
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+    "node_modules/postcss/node_modules/nanoid": {
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+      "integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "bin": {
+        "nanoid": "bin/nanoid.cjs"
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+        "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
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@@ -16236,22 +16258,6 @@
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@@ -16721,6 +16727,14 @@
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@@ -23571,7 +23585,8 @@
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+      "peer": true
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@@ -25221,7 +25236,8 @@
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@@ -25941,26 +25957,46 @@
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+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.0.tgz",
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-        "source-map": "^0.6.1",
-        "supports-color": "^6.1.0"
+        "nanoid": "^3.3.6",
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-        "postcss": "^7.0.32",
+        "icss-utils": "^5.0.0",
         "postcss-selector-parser": "^6.0.2",
         "postcss-value-parser": "^4.1.0"
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     "postcss-modules-scope": {
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-        "postcss": "^7.0.6"
+        "icss-utils": "^5.0.0"
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+      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.13.tgz",
+      "integrity": "sha512-EaV1Gl4mUEV4ddhDnv/xtj7sxwrwxdetHdWUGnT4VJQf+4d05v6lHYZr8N573k5Z0BViss7BDhfWtKS3+sfAqQ==",
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+      "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz",
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@@ -31665,15 +31672,6 @@
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@@ -32034,6 +32032,11 @@
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+    "source-map-js": {
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+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
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diff --git a/package.json b/package.json
index 1a159d0d..c0bfcd8e 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "colorspaces": "0.1.4",
     "cookie-parser": "^1.0.1",
     "cookie-session": "^1.0.1",
-    "css-loader": "^3.4.0",
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     "csurf": "^1.1.0",
     "d3": "~3",
     "d3-tip": "git://github.com/sorawee/d3-tip.git",