Add a container component (like bootstrap's).

Just meant to help with sizing.

src/Container.css

@@ -0,0 +1,21 @@
+.Container {
+  padding-right: 15px;
+  padding-left: 15px;
+  margin-right: auto;
+  margin-left: auto;
+}
+@media (min-width: 768px) {
+  .Container {
+    width: 750px;
+  }
+}
+@media (min-width: 992px) {
+  .Container {
+    width: 970px;
+  }
+}
+@media (min-width: 1200px) {
+  .Container {
+    width: 1170px;
+  }
+}

src/Container.tsx

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+import * as React from 'react';
+
+import './Container.css';
+
+export default ({children}: {children: any}) => (
+  <div className="Container">{children}</div>
+);