I'm using Material-UI version 1. installed by this command:

npm install -S material-ui@next

Everytime I want to use , an unwanted horizontal scroll appears in the page.

Code:

import React from 'react';
import PropTypes from 'prop-types';
import { withStyles, createStyleSheet } from 'material-ui/styles';
import Paper from 'material-ui/Paper';
import Grid from 'material-ui/Grid';


/* project imports */
import NavMenu from './Page-Parts/NavMenu';
import LoginPanel from './Login-Parts/LoginPanel';

const styleSheet = createStyleSheet('FullWidthGrid', theme => ({
  root: {
    flexGrow: 1,
    marginTop: 0,
  },
  paper: {
    padding: 16,
    textAlign: 'center',
    color: theme.palette.text.secondary,
    marginTop: "3rem"
  },
}));

function Login(props) {
    const classes = props.classes;
    return (
    <div className={classes.root}>
      <Grid container gutter={24} justify='center'>
        <Grid item xs={12} md={12} sm={12} lg={12}>
          <NavMenu/>
        </Grid>
        <Grid item xs={6} sm={6} md={6} lg={6}>
          <Paper className={classes.paper}>
            <LoginPanel />
          </Paper>
        </Grid>
      </Grid>
    </div>
    );
}

Login.propTypes = {
  classes: PropTypes.object.isRequired,
};

export default withStyles(styleSheet)(Login);

Bootstrap and other grid layout options are in conflict with this library. When I use <Grid> in other parts of a component(for example in drawer), horizontal scroll appears makes the UI ugly NavMenu and LoginPanel are some self-made components and they work and using them without doesn't cause horizontal scroll.