styles.ts

import { makeStyles } from '@material-ui/core';

export const useStyles = makeStyles((theme) => ({
    bottomNavigation: {
      position: 'sticky',
      paddingLeft: 16,
      paddingRight: 16,
      bottom: 0,
      // ... 
     }
    icon: {
      width: 24,
      height: 24,
    },
    //...
});