feat: Added Theme and migrate to emotion@10.x 🚀 (#286)

* chore: updated emotion dependency

* feat: introduced theme

* refactor: updated emotion styles

* fix: fixed emotion error

* fix: fixed tests

* chore: add missing types

Co-Authored-By: Thomas Klein <tmkn@users.noreply.github.com>

src/components/Loading/Loading.test.tsx

@@ -1,11 +1,12 @@
 import React from 'react';
-import { shallow } from 'enzyme';
+
+import { render } from '../../utils/test-react-testing-library';
 
 import Loading from './Loading';
 
 describe('<Loading /> component', () => {
   test('should render the component in default state', () => {
-    const wrapper = shallow(<Loading />);
-    expect(wrapper.html()).toMatchSnapshot();
+    const { container } = render(<Loading />);
+    expect(container.firstChild).toMatchSnapshot();
   });
 });