diff --git a/postcss.config.json b/postcss.config.json
new file mode 100644
index 00000000..be3585cf
--- /dev/null
+++ b/postcss.config.json
@@ -0,0 +1,18 @@
+{
+    "use": [
+        "autoprefixer",
+        "postcss-import",
+        "postcss-simple-vars",
+        "postcss-extend",
+        "postcss-nested",
+        "postcss-mixins",
+        "postcss-strip-inline-comments"
+    ],
+    "parser": "postcss-scss",
+    "input": "src/skins/vector/css/themes/[^_]*.scss",
+    "dir": "build",
+    "local-plugins": true,
+    "autoprefixer": {
+        "browsers": "> 5%"
+    }
+}
\ No newline at end of file
diff --git a/src/skins/vector/css/themes/_dark.scss b/src/skins/vector/css/themes/_dark.scss
new file mode 100644
index 00000000..e2c33e3e
--- /dev/null
+++ b/src/skins/vector/css/themes/_dark.scss
@@ -0,0 +1,69 @@
+
+// typical text (dark-on-white in light skin)
+$primary-fg-color: #dddddd;
+$primary-bg-color: #2d2d2d;
+
+// used for focusing form controls
+$focus-bg-color: #101010;
+
+// used for dialog box text
+$light-fg-color: #747474;
+
+// button UI (white-on-green in light skin)
+$accent-fg-color: $primary-bg-color;
+$accent-color: #76CFA6;
+
+// red warning colour
+$warning-color: #ff0064;
+
+// left-panel style muted accent color
+$secondary-accent-color: $primary-bg-color;
+
+// used by AddressSelector
+$selected-color: #eaf5f0;
+
+// selected for hoverover & selected event tiles
+$event-selected-color: #353535;
+
+// used for the hairline dividers in RoomView
+$primary-hairline-color: #474747;
+
+// used for the border of input text fields
+$input-border-color: #3a3a3a;
+
+// apart from login forms, which have stronger border
+$strong-input-border-color: #656565;
+
+// context menus
+$menu-border-color: rgba(187, 187, 187, 0.5);
+$menu-bg-color: #373737;
+
+$avatar-initial-color: #2d2d2d;
+
+// ********************
+
+$roomtile-name-color: rgba(186, 186, 186, 0.8);
+$roomtile-selected-bg-color: rgba(0, 0, 0, 0.8);
+
+$roomsublist-label-fg-color: $primary-fg-color;
+$roomsublist-label-bg-color: #454545;
+
+// ********************
+
+// event tile lifecycle
+$event-encrypting-color: #abddbc;
+$event-sending-color: #ddd;
+$event-notsent-color: #f44;
+
+// event timestamp
+$event-timestamp-color: #acacac;
+
+// e2e
+$e2e-verified-color: #76cfa5; // N.B. *NOT* the same as $accent-color
+$e2e-unverified-color: #e8bf37;
+$e2e-warning-color: #ba6363;
+
+/*** ImageView ***/
+$lightbox-bg-color: #454545;
+$lightbox-fg-color: #ffffff;
+$lightbox-border-color: #ffffff;