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client/app/pages/not-found/not-found.scss

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+.not-found {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  min-height: 700px;
+}

client/app/pages/not-found/not-found.tsx

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+import React from 'react';
+import { RouteComponentProps } from 'react-router-dom';
+import { ContentContainer } from '../../components';
+import './not-found.scss';
+
+interface Props extends RouteComponentProps<any> {}
+
+interface State {}
+
+export class NotFound extends React.Component<Props, State> {
+
+  render() {
+    return (
+      <ContentContainer className="not-found">
+        <h1>Oops! This page doesn't exist!</h1>
+      </ContentContainer>
+    );
+  }
+
+}