Material UI Tab label font-size is really small - reactjs

Question

I started to use material ui tabs and I'm having issues with the font size of the Tab labels because they are really small...
This is my code:
import React from 'react';
import PropTypes from 'prop-types';
import { withStyles } from '#material-ui/core/styles';
import AppBar from '#material-ui/core/AppBar';
import Tabs from '#material-ui/core/Tabs';
import Tab from '#material-ui/core/Tab';
import Typography from '#material-ui/core/Typography';
function TabContainer(props) {
return (
<Typography component="div" style={{ padding: 8 * 3 }}>
{props.children}
</Typography>
);
}
TabContainer.propTypes = {
children: PropTypes.node.isRequired,
};
const styles = theme => ({
root: {
flexGrow: 1,
backgroundColor: theme.palette.background.paper,
},
tabRoot: {
backgroundColor: theme.palette.background.paper,
flexGrow: 1,
color: 'black',
fontWeight: 'bold'
}
});
class SimpleTabs extends React.Component {
state = {
value: 0,
};
handleChange = (event, value) => {
this.setState({ value });
};
render() {
const { classes } = this.props;
const { value } = this.state;
return (
<div className={classes.root}>
<AppBar position="static">
<Tabs className={classes.tabRoot} value={value} onChange={this.handleChange}>
<Tab label="Item One" />
<Tab label="Item Two" />
</Tabs>
</AppBar>
{value === 0 && <TabContainer>Item One</TabContainer>}
{value === 1 && <TabContainer>Item Two</TabContainer>}
{value === 2 && <TabContainer>Item Three</TabContainer>}
</div>
);
}
}
SimpleTabs.propTypes = {
classes: PropTypes.object.isRequired,
};
export default withStyles(styles)(SimpleTabs);
Is there any way to increase the size of those labels?

Answer 1

Material-ui Tab component label prop type is node. So if you want to add styles you need to put plain text inside div or span, o another html component and add className.
<Tab label={<span className={classes.tabLabel}>Label</span>}/>

Answer 2

1. You can set the style of the tab, and use an own wrapper component, e.g. like TabBigger:
import React from 'react';
import { withStyles } from '#material-ui/core/styles';
import AppBar from '#material-ui/core/AppBar';
import Tabs from '#material-ui/core/Tabs';
import Tab from '#material-ui/core/Tab';
import Typography from '#material-ui/core/Typography';
const styles = theme => ({
root: { backgroundColor: '#0af' },
tabRoot: { backgroundColor: '#0a6' },
label: {
backgroundColor: '#aa0',
fontSize: '22px'
},
});
function TabContainer(props) {
return (
<Typography component="div" style={{ padding: 8 * 3 }}>
{props.children}
</Typography>
);
}
const TabBigger = withStyles(styles)(( props )=>{
return (
<Tab className={props.classes.label} {...props}/>
);
});
class SimpleTabs extends React.Component {
state = {
value: 0,
};
handleChange = (event, value) => {
this.setState({ value });
};
render() {
const { classes } = this.props;
const { value } = this.state;
return (
<div className={classes.root}>
<AppBar position="static">
<Tabs className={classes.tabRoot} value={value} onChange={this.handleChange}>
<TabBigger label="Item One" />
<TabBigger label="Item Two" />
</Tabs>
</AppBar>
{value === 0 && <TabContainer>Item One</TabContainer>}
{value === 1 && <TabContainer>Item Two</TabContainer>}
{value === 2 && <TabContainer>Item Three</TabContainer>}
</div>
);
}
}
export default withStyles(styles)(SimpleTabs);
2. Alternatively, you might want to set the style of the tab-label (instead of the whole Tab component) with the MUI-rule labelContainer:
<Tab classes={{ root: { props.classes.tab }, labelContainer: props.classes.label }} />

Answer 3

With new versions of MUI you can specify the label component directly in the component
import React from 'react';
import { withStyles } from '#material-ui/core/styles';
import AppBar from '#material-ui/core/AppBar';
import Tabs from '#material-ui/core/Tabs';
import Tab from '#material-ui/core/Tab';
import Typography from '#material-ui/core/Typography';
const styles = theme => ({
root: { backgroundColor: '#0af' },
tabRoot: { backgroundColor: '#0a6' },
});
function TabContainer(props) {
return (
<Typography component="div" style={{ padding: 8 * 3 }}>
{props.children}
</Typography>
);
}
class SimpleTabs extends React.Component {
state = {
value: 0,
};
handleChange = (event, value) => {
this.setState({ value });
};
render() {
const { classes } = this.props;
const { value } = this.state;
return (
<div className={classes.root}>
<AppBar position="static">
<Tabs className={classes.tabRoot} value={value} onChange={this.handleChange}>
<Tab label={(<Typography variant="h6">Item One</Typography>)} />
<Tab label={(<Typography variant="h6">Item Two</Typography>)} />
</Tabs>
</AppBar>
{value === 0 && <TabContainer>Item One</TabContainer>}
{value === 1 && <TabContainer>Item Two</TabContainer>}
{value === 2 && <TabContainer>Item Three</TabContainer>}
</div>
);
}
}
export default withStyles(styles)(SimpleTabs);