Responsively changing layout to single-column + nav on smaller screens

app/assets/javascripts/components/features/ui/components/tabs_bar.jsx

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+import { Link } from 'react-router';
+
+const outerStyle = {
+  background: '#373b4a',
+  margin: '10px',
+  flex: '0 0 auto',
+  marginBottom: '0',
+  display: 'flex'
+};
+
+const tabStyle = {
+  display: 'block',
+  flex: '1 1 auto',
+  padding: '10px',
+  color: '#fff',
+  textDecoration: 'none',
+  fontSize: '12px',
+  fontWeight: '500',
+  borderBottom: '2px solid #373b4a'
+};
+
+const tabActiveStyle = {
+  borderBottom: '2px solid #2b90d9',
+  color: '#2b90d9'
+};
+
+const TabsBar = () => {
+  return (
+    <div style={outerStyle}>
+      <Link style={tabStyle} activeStyle={tabActiveStyle} to='/statuses/new'><i className='fa fa-fw fa-pencil' /> Compose</Link>
+      <Link style={tabStyle} activeStyle={tabActiveStyle} to='/statuses/home'><i className='fa fa-fw fa-home' /> Home</Link>
+      <Link style={tabStyle} activeStyle={tabActiveStyle} to='/statuses/mentions'><i className='fa fa-fw fa-at' /> Mentions</Link>
+      <Link style={tabStyle} activeStyle={tabActiveStyle} to='/statuses/all'><i className='fa fa-fw fa-globe' /> Public</Link>
+    </div>
+  );
+};
+
+export default TabsBar;