Add normalize.css and fix some basic styling

src/components/Calculator.scss

@@ -0,0 +1,10 @@
+.calculator {
+  &__points {
+    color: white;
+    text-align: center;
+  }
+}
+
+.index__class-picker {
+  margin: 2em 0;
+}

src/components/Calculator.tsx

@@ -1,3 +1,4 @@
+import './Calculator.scss'
 import React from 'react'
 import { Map } from 'immutable'
 import { TalentTree } from './TalentTree'