diff --git a/Viewer/css/layout.css b/Viewer/css/layout.css
index ed924f41..ac81f3c9 100755
--- a/Viewer/css/layout.css
+++ b/Viewer/css/layout.css
@@ -20,6 +20,28 @@
 }
 
 
+/******************************************************** theaming ***/
+
+.viewer,
+.viewer.gray {
+	--text-color: white;
+	--background-color: #333;
+	--dialog-background-color: #555;
+}
+
+.viewer.dark {
+	--text-color: white;
+	--background-color: #0a0a0a;
+	--dialog-background-color: #333;
+}
+
+.viewer.light {
+	--text-color: black;
+	--background-color: white;
+}
+
+
+
 /********************************************************* utility ***/
 .expanding-text .hidden {
 	display: none;
@@ -144,7 +166,7 @@
 	to { 
 		opacity: 0; 
 	}
-};
+}
 
 
 
@@ -2116,10 +2138,10 @@ progress:not(value)::-webkit-progress-bar {
 
 .gray.viewer,
 .gray.viewer .overlay-block .background {
-	background: #333;
+	background: var(--background-color);
 }
 .gray.viewer .overlay-block .dialog {
-	background: #555;
+	background: var(--dialog-background-color);
 }
 .gray.viewer .overlay-block:hover .background:after {
 	color: silver;
@@ -2131,10 +2153,10 @@ progress:not(value)::-webkit-progress-bar {
 
 .dark.viewer,
 .dark.viewer .overlay-block .background {
-	background: #0a0a0a;
+	background: var(--background-color);
 }
 .dark.viewer .overlay-block .dialog {
-	background: #333;
+	background: var(--dialog-background-color);
 }
 .dark.viewer .overlay-block:hover .background:after {
 	color: gray;
diff --git a/Viewer/package-lock.json b/Viewer/package-lock.json
index 69da64c9..db0eb05e 100644
--- a/Viewer/package-lock.json
+++ b/Viewer/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "ImageGrid.Viewer.g4",
-  "version": "4.0.7a",
+  "version": "4.0.8a",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "ImageGrid.Viewer.g4",
-      "version": "4.0.7a",
+      "version": "4.0.8a",
       "dependencies": {
         "app-module-path": "*",
         "async-json": "0.0.2",
@@ -42,7 +42,6 @@
       "devDependencies": {
         "asar": "^3.0.1",
         "electron-rebuild": "*",
-        "less": "*",
         "rcedit": "^3.0.0"
       },
       "optionalDependencies": {
@@ -886,18 +885,6 @@
       "integrity": "sha512-ty/fTekppD2fIwRvnZAVdeOiGd1c7YXEixbgJTNzqcxJWKQnjJ/V1bNEEE6hygpM3WjwHFUVK6HTjWSzV4a8sQ==",
       "dev": true
     },
-    "node_modules/copy-anything": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/copy-anything/-/copy-anything-2.0.6.tgz",
-      "integrity": "sha512-1j20GZTsvKNkc4BY3NpMOM8tt///wY3FpIzozTOFO2ffuZcV61nojHXVKIy3WM+7ADCy5FVhdZYHYDdgTU0yJw==",
-      "dev": true,
-      "dependencies": {
-        "is-what": "^3.14.1"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/mesqueeb"
-      }
-    },
     "node_modules/core-util-is": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
@@ -1205,19 +1192,6 @@
       "integrity": "sha512-2bmlRpNKBxT/CRmPOlyISQpNj+qSeYvcym/uT0Jx2bMOlKLtSy1ZmLuVxSEKKyor/N5yhvp/ZiG1oE3DEYMSFA==",
       "dev": true
     },
-    "node_modules/errno": {
-      "version": "0.1.8",
-      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.8.tgz",
-      "integrity": "sha512-dJ6oBr5SQ1VSd9qkk7ByRgb/1SH4JZjCHSW/mr63/QcXO9zLVxvJ6Oy13nio03rxpSnVDDjFor75SjVeZWPW/A==",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "prr": "~1.0.1"
-      },
-      "bin": {
-        "errno": "cli.js"
-      }
-    },
     "node_modules/es6-error": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
@@ -1816,19 +1790,6 @@
         "object-run": "^1.0.1"
       }
     },
-    "node_modules/image-size": {
-      "version": "0.5.5",
-      "resolved": "https://registry.npmjs.org/image-size/-/image-size-0.5.5.tgz",
-      "integrity": "sha512-6TDAlDPZxUFCv+fuOkIoXT/V/f3Qbq8e37p+YOiYrUv3v9cc3/6x78VdfPgFVaB9dZYeLUfKgHRebpkm/oP2VQ==",
-      "dev": true,
-      "optional": true,
-      "bin": {
-        "image-size": "bin/image-size.js"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/imurmurhash": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
@@ -1934,12 +1895,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/is-what": {
-      "version": "3.14.1",
-      "resolved": "https://registry.npmjs.org/is-what/-/is-what-3.14.1.tgz",
-      "integrity": "sha512-sNxgpk9793nzSs7bA6JQJGeIuRBQhAaNGG77kzYQgMkrID+lS6SlK07K5LaptscDlSaIgH+GPFzf+d75FVxozA==",
-      "dev": true
-    },
     "node_modules/is-wsl": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-2.2.0.tgz",
@@ -2020,32 +1975,6 @@
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       }
     },
-    "node_modules/less": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/less/-/less-4.1.3.tgz",
-      "integrity": "sha512-w16Xk/Ta9Hhyei0Gpz9m7VS8F28nieJaL/VyShID7cYvP6IL5oHeL6p4TXSDJqZE/lNv0oJ2pGVjJsRkfwm5FA==",
-      "dev": true,
-      "dependencies": {
-        "copy-anything": "^2.0.1",
-        "parse-node-version": "^1.0.1",
-        "tslib": "^2.3.0"
-      },
-      "bin": {
-        "lessc": "bin/lessc"
-      },
-      "engines": {
-        "node": ">=6"
-      },
-      "optionalDependencies": {
-        "errno": "^0.1.1",
-        "graceful-fs": "^4.1.2",
-        "image-size": "~0.5.0",
-        "make-dir": "^2.1.0",
-        "mime": "^1.4.1",
-        "needle": "^3.1.0",
-        "source-map": "~0.6.0"
-      }
-    },
     "node_modules/log-symbols": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-4.1.0.tgz",
@@ -2097,30 +2026,6 @@
         "node": ">=10.0.0"
       }
     },
-    "node_modules/make-dir": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
-      "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "pify": "^4.0.1",
-        "semver": "^5.6.0"
-      },
-      "engines": {
-        "node": ">=6"
-      }
-    },
-    "node_modules/make-dir/node_modules/semver": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
-      "dev": true,
-      "optional": true,
-      "bin": {
-        "semver": "bin/semver"
-      }
-    },
     "node_modules/make-fetch-happen": {
       "version": "10.2.1",
       "resolved": "https://registry.npmjs.org/make-fetch-happen/-/make-fetch-happen-10.2.1.tgz",
@@ -2177,19 +2082,6 @@
       "resolved": "https://registry.npmjs.org/microee/-/microee-0.0.6.tgz",
       "integrity": "sha512-/LdL3jiBWDJ3oQIRLgRhfeCZNE3patM1LiwCC124+/HHn10sI/G2OAyiMfTNzH5oYWoZBk0tRZADAUOv+0Wt0A=="
     },
-    "node_modules/mime": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
-      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
-      "dev": true,
-      "optional": true,
-      "bin": {
-        "mime": "cli.js"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/mimic-fn": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
@@ -2436,34 +2328,6 @@
       "resolved": "https://registry.npmjs.org/napi-build-utils/-/napi-build-utils-1.0.2.tgz",
       "integrity": "sha512-ONmRUqK7zj7DWX0D9ADe03wbwOBZxNAfF20PlGfCWQcD3+/MakShIHrMqx9YwPTfxDdF1zLeL+RGZiR9kGMLdg=="
     },
-    "node_modules/needle": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/needle/-/needle-3.2.0.tgz",
-      "integrity": "sha512-oUvzXnyLiVyVGoianLijF9O/RecZUf7TkBfimjGrLM4eQhXyeJwM6GeAWccwfQ9aa4gMCZKqhAOuLaMIcQxajQ==",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "debug": "^3.2.6",
-        "iconv-lite": "^0.6.3",
-        "sax": "^1.2.4"
-      },
-      "bin": {
-        "needle": "bin/needle"
-      },
-      "engines": {
-        "node": ">= 4.4.x"
-      }
-    },
-    "node_modules/needle/node_modules/debug": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
-      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
-      "dev": true,
-      "optional": true,
-      "dependencies": {
-        "ms": "^2.1.1"
-      }
-    },
     "node_modules/negotiator": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
@@ -2792,15 +2656,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/parse-node-version": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/parse-node-version/-/parse-node-version-1.0.1.tgz",
-      "integrity": "sha512-3YHlOa/JgH6Mnpr05jP9eDG254US9ek25LyIxZlDItp2iJtwyaXQb57lBYLdT3MowkUFYEV2XXNAYIPlESvJlA==",
-      "dev": true,
-      "engines": {
-        "node": ">= 0.10"
-      }
-    },
     "node_modules/path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -2858,16 +2713,6 @@
         "webworkify": "^1.5.0"
       }
     },
-    "node_modules/pify": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
-      "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
-      "dev": true,
-      "optional": true,
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/prebuild-install": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/prebuild-install/-/prebuild-install-7.1.1.tgz",
@@ -2920,13 +2765,6 @@
         "node": ">=10"
       }
     },
-    "node_modules/prr": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/prr/-/prr-1.0.1.tgz",
-      "integrity": "sha512-yPw4Sng1gWghHQWj0B3ZggWUm4qVbPwPFcRG8KyxiU7J2OHFSoEHKS+EZ3fv5l1t9CyCiop6l/ZYeWbrgoQejw==",
-      "dev": true,
-      "optional": true
-    },
     "node_modules/pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
@@ -3134,13 +2972,6 @@
       "dev": true,
       "optional": true
     },
-    "node_modules/sax": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
-      "dev": true,
-      "optional": true
-    },
     "node_modules/semver": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
@@ -3358,16 +3189,6 @@
         "node": ">= 10"
       }
     },
-    "node_modules/source-map": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-      "dev": true,
-      "optional": true,
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/sprintf-js": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.1.2.tgz",
@@ -3609,12 +3430,6 @@
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
       "integrity": "sha512-ev2QzSzWPYmy9GuqfIVildA4OdcGLeFZQrq5ys6RtiuF+RQQiZWr8TZNyAcuVXyQRYfEO+MsoB/1BuQVhOJuoQ=="
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-    "node_modules/tslib": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.5.0.tgz",
-      "integrity": "sha512-336iVw3rtn2BUK7ORdIAHTyxHGRIHVReokCR3XjbckJMK7ms8FysBfhLR8IXnAgy7T0PTPNBWKiH514FOW/WSg==",
-      "dev": true
-    },
     "node_modules/tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -4519,15 +4334,6 @@
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       "dev": true
     },
-    "copy-anything": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/copy-anything/-/copy-anything-2.0.6.tgz",
-      "integrity": "sha512-1j20GZTsvKNkc4BY3NpMOM8tt///wY3FpIzozTOFO2ffuZcV61nojHXVKIy3WM+7ADCy5FVhdZYHYDdgTU0yJw==",
-      "dev": true,
-      "requires": {
-        "is-what": "^3.14.1"
-      }
-    },
     "core-util-is": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
@@ -4742,16 +4548,6 @@
       "integrity": "sha512-2bmlRpNKBxT/CRmPOlyISQpNj+qSeYvcym/uT0Jx2bMOlKLtSy1ZmLuVxSEKKyor/N5yhvp/ZiG1oE3DEYMSFA==",
       "dev": true
     },
-    "errno": {
-      "version": "0.1.8",
-      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.8.tgz",
-      "integrity": "sha512-dJ6oBr5SQ1VSd9qkk7ByRgb/1SH4JZjCHSW/mr63/QcXO9zLVxvJ6Oy13nio03rxpSnVDDjFor75SjVeZWPW/A==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "prr": "~1.0.1"
-      }
-    },
     "es6-error": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/es6-error/-/es6-error-4.1.1.tgz",
@@ -5225,13 +5021,6 @@
         "object-run": "^1.0.1"
       }
     },
-    "image-size": {
-      "version": "0.5.5",
-      "resolved": "https://registry.npmjs.org/image-size/-/image-size-0.5.5.tgz",
-      "integrity": "sha512-6TDAlDPZxUFCv+fuOkIoXT/V/f3Qbq8e37p+YOiYrUv3v9cc3/6x78VdfPgFVaB9dZYeLUfKgHRebpkm/oP2VQ==",
-      "dev": true,
-      "optional": true
-    },
     "imurmurhash": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
@@ -5310,12 +5099,6 @@
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       "dev": true
     },
-    "is-what": {
-      "version": "3.14.1",
-      "resolved": "https://registry.npmjs.org/is-what/-/is-what-3.14.1.tgz",
-      "integrity": "sha512-sNxgpk9793nzSs7bA6JQJGeIuRBQhAaNGG77kzYQgMkrID+lS6SlK07K5LaptscDlSaIgH+GPFzf+d75FVxozA==",
-      "dev": true
-    },
     "is-wsl": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-2.2.0.tgz",
@@ -5377,24 +5160,6 @@
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-    "less": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/less/-/less-4.1.3.tgz",
-      "integrity": "sha512-w16Xk/Ta9Hhyei0Gpz9m7VS8F28nieJaL/VyShID7cYvP6IL5oHeL6p4TXSDJqZE/lNv0oJ2pGVjJsRkfwm5FA==",
-      "dev": true,
-      "requires": {
-        "copy-anything": "^2.0.1",
-        "errno": "^0.1.1",
-        "graceful-fs": "^4.1.2",
-        "image-size": "~0.5.0",
-        "make-dir": "^2.1.0",
-        "mime": "^1.4.1",
-        "needle": "^3.1.0",
-        "parse-node-version": "^1.0.1",
-        "source-map": "~0.6.0",
-        "tslib": "^2.3.0"
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     "log-symbols": {
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       "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-4.1.0.tgz",
@@ -5427,26 +5192,6 @@
         "readable-stream": "^3.6.0"
       }
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-      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
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-      "optional": true,
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-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
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       "version": "10.2.1",
       "resolved": "https://registry.npmjs.org/make-fetch-happen/-/make-fetch-happen-10.2.1.tgz",
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diff --git a/Viewer/package.json b/Viewer/package.json
index cb14439e..da7cc021 100644
--- a/Viewer/package.json
+++ b/Viewer/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ImageGrid.Viewer.g4",
   "main": "index.html",
-  "version": "4.0.7a",
+  "version": "4.0.8a",
   "author": "Alex A. Naanou <alex.nanou@gmail.com> (https://github.com/flynx)",
   "contributors": [],
   "repository": "github:flynx/ImageGrid",