flickering background when I toggle open and close the burger menu.. maybe deals with that console error

[stanjdev]

[stanjdev]

index.js:1 Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode. Instead, add a ref directly to the element you want to reference. Learn more about using refs safely here: https://fb.me/react-strict-mode-find-node

[stanjdev]

removed <React.StrictMode> https://reactjs.org/docs/strict-mode.html#warning-about-deprecated-finddomnode-usage