I'm working with a new app and trying to create a "menu" so when I swype from the left side of the screen it opens.
On a codeSandBox it works. Here is the running example (run it on mobile)
It works for me, but when I try to run it locally it doesn't.
It is the exact same code I have on both codesandbox and locally.
Is different from the codesandbox.
The codesandbox has this part. Is there a reason why this React isn't writing this part? 
Here is a list of my dependencies:
"@material-ui/core": "^4.11.0",
"@material-ui/icons": "^4.9.1",
"@material-ui/styles": "^4.10.0",
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"firebase": "^7.19.0",
"fontsource-roboto": "^3.0.3",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-router-dom": "^5.2.0",
"react-scripts": "3.4.3"
Am I missing something? I couldn't find it in the documentation, and because it works on the codesandbox, I'm almost sure it is my fault somewhere, but I can't seem to get it. Thanks in advance!
