jams-react-client: make typography darker

Change-Id: I7ba55d0673d8272fb55557b7ff1f80d6449def32

jams-react-client/src/index.js

@@ -40,6 +40,7 @@ import SignIn from "layouts/SignIn.js";
 import "assets/css/material-dashboard-react.css?v=1.9.0";
 
 import "./i18n";
+import { grayColor } from "assets/jss/material-dashboard-react";
 
 const hist = createBrowserHistory();
 
@@ -52,6 +53,11 @@ const theme = createTheme({
       main: "#ffffff",
     },
   },
+  typography: {
+    allVariants: {
+      color: grayColor[2],
+    },
+  },
 });
 
 if (process.env.NODE_ENV === "development") {