diff --git a/package-lock.json b/package-lock.json
index 9246fdf1a7c0..ea21fee7bf9c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -257,16 +257,6 @@
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       }
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@@ -1000,7 +990,6 @@
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@@ -1555,8 +1544,8 @@
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+        "JSONStream": "1.3.1",
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@@ -2959,791 +2948,6 @@
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-            "debug": "2.6.8",
-            "fstream": "1.0.11",
-            "fstream-ignore": "1.0.5",
-            "once": "1.4.0",
-            "readable-stream": "2.2.9",
-            "rimraf": "2.6.1",
-            "tar": "2.2.1",
-            "uid-number": "0.0.6"
-          }
-        },
-        "tough-cookie": {
-          "version": "2.3.2",
-          "bundled": true,
-          "optional": true,
-          "requires": {
-            "punycode": "1.4.1"
-          }
-        },
-        "tunnel-agent": {
-          "version": "0.6.0",
-          "bundled": true,
-          "optional": true,
-          "requires": {
-            "safe-buffer": "5.0.1"
-          }
-        },
-        "tweetnacl": {
-          "version": "0.14.5",
-          "bundled": true,
-          "optional": true
-        },
-        "uid-number": {
-          "version": "0.0.6",
-          "bundled": true,
-          "optional": true
-        },
-        "util-deprecate": {
-          "version": "1.0.2",
-          "bundled": true
-        },
-        "uuid": {
-          "version": "3.0.1",
-          "bundled": true,
-          "optional": true
-        },
-        "verror": {
-          "version": "1.3.6",
-          "bundled": true,
-          "optional": true,
-          "requires": {
-            "extsprintf": "1.0.2"
-          }
-        },
-        "wide-align": {
-          "version": "1.1.2",
-          "bundled": true,
-          "optional": true,
-          "requires": {
-            "string-width": "1.0.2"
-          }
-        },
-        "wrappy": {
-          "version": "1.0.2",
-          "bundled": true
-        }
-      }
-    },
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
@@ -4904,6 +4108,16 @@
       "integrity": "sha1-T9kss04OnbPInIYi7PUfm5eMbLk=",
       "dev": true
     },
+    "JSONStream": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
+      "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
+      "dev": true,
+      "requires": {
+        "jsonparse": "1.3.1",
+        "through": "2.3.8"
+      }
+    },
     "jsprim": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
@@ -6425,6 +5639,40 @@
         "postcss-value-parser": "3.3.0"
       }
     },
+    "postcss-custom-properties": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/postcss-custom-properties/-/postcss-custom-properties-6.1.0.tgz",
+      "integrity": "sha1-nK8RUaxBsenmTTov+ezplsoYl30=",
+      "requires": {
+        "balanced-match": "1.0.0",
+        "postcss": "6.0.11"
+      },
+      "dependencies": {
+        "has-flag": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
+          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE="
+        },
+        "postcss": {
+          "version": "6.0.11",
+          "resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.11.tgz",
+          "integrity": "sha512-DsnIzznNRQprsGTALpkC0xjDygo+QcOd+qVjP9+RjyzrPiyYOXBGOwoJ4rAiiE4lu6JggQ/jW4niY24WLxuncg==",
+          "requires": {
+            "chalk": "2.1.0",
+            "source-map": "0.5.7",
+            "supports-color": "4.4.0"
+          }
+        },
+        "supports-color": {
+          "version": "4.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
+          "integrity": "sha512-rKC3+DyXWgK0ZLKwmRsrkyHVZAjNkfzeehuFWdGGcqGDTZFH73+RH6S/RDAAxl9GusSjZSUWYLmT9N5pzXFOXQ==",
+          "requires": {
+            "has-flag": "2.0.0"
+          }
+        }
+      }
+    },
     "postcss-discard-comments": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/postcss-discard-comments/-/postcss-discard-comments-2.0.4.tgz",
@@ -7969,6 +7217,14 @@
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "string-width": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
@@ -7990,14 +7246,6 @@
         "function-bind": "1.1.1"
       }
     },
-    "string_decoder": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "stringstream": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
diff --git a/package.json b/package.json
index 347d4d51785f..403b6f843de8 100644
--- a/package.json
+++ b/package.json
@@ -77,6 +77,7 @@
     "nopt": "^4.0.1",
     "opn": "~5.1.0",
     "portfinder": "~1.0.12",
+    "postcss-custom-properties": "^6.1.0",
     "postcss-loader": "^1.3.3",
     "postcss-url": "^5.1.2",
     "raw-loader": "^0.5.1",
diff --git a/packages/@angular/cli/models/webpack-configs/styles.ts b/packages/@angular/cli/models/webpack-configs/styles.ts
index c3c600e3e4ec..a56aa4f31c1b 100644
--- a/packages/@angular/cli/models/webpack-configs/styles.ts
+++ b/packages/@angular/cli/models/webpack-configs/styles.ts
@@ -11,6 +11,7 @@ const cssnano = require('cssnano');
 const postcssUrl = require('postcss-url');
 const autoprefixer = require('autoprefixer');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
+const customProperties = require('postcss-custom-properties');
 
 /**
  * Enumerate loaders and their dependencies from this file to let the dependency validator
@@ -79,6 +80,7 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
         }
       }),
       autoprefixer(),
+      customProperties({ preserve: true})
     ].concat(
         minimizeCss ? [cssnano(minimizeOptions)] : []
     );
@@ -87,7 +89,8 @@ export function getStylesConfig(wco: WebpackConfigOptions) {
     variableImports: {
       'autoprefixer': 'autoprefixer',
       'postcss-url': 'postcssUrl',
-      'cssnano': 'cssnano'
+      'cssnano': 'cssnano',
+      'postcss-custom-properties': 'customProperties'
     },
     variables: { minimizeCss, baseHref, deployUrl }
   };
diff --git a/packages/@angular/cli/package.json b/packages/@angular/cli/package.json
index d3a9e0cca460..a642dfe160af 100644
--- a/packages/@angular/cli/package.json
+++ b/packages/@angular/cli/package.json
@@ -61,6 +61,7 @@
     "nopt": "^4.0.1",
     "opn": "~5.1.0",
     "portfinder": "~1.0.12",
+    "postcss-custom-properties": "^6.1.0",
     "postcss-loader": "^1.3.3",
     "postcss-url": "^5.1.2",
     "raw-loader": "^0.5.1",