diff --git a/src/theme.js b/src/theme.js
new file mode 100644
index 0000000..37236ff
--- /dev/null
+++ b/src/theme.js
@@ -0,0 +1,19 @@
+import { createMuiTheme } from '@material-ui/core/styles'
+
+/**
+ * Returns custom MUI Theme.
+ * @example
+ * import webqueue2Theme from "./theme";
+ * const theme = webqueue2Theme(darkMode);
+ * @param {boolean} [darkMode=false] Whether theme should be dark or not.
+ * @returns {Theme} MUI Theme.
+ */
+export default function theme(darkMode=false){
+    return (
+        createMuiTheme({
+            "palette": {
+                "type": darkMode ? "dark" : "light",
+            }
+        })
+    );
+}
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