How to change mui button font size in react js?

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To change mui button font size, set font-size: 30px !important; in .MuiButton-contained. It will change mui button font size.

Today, I am going to show you, how to change mui button font size in react js.


Install the following packages to use mui button font size in react js.


npm install @mui/material @emotion/react @emotion/styled


yarn add @mui/material @emotion/react @emotion/styled

MUI material change mui button font size example.

The below code is an example of changing mui button font size using mui.


import * as React from 'react';
import Stack from '@mui/material/Stack';
import Button from '@mui/material/Button';
import "./App.css"

export default function BasicButtons() {
  return (
    <Stack spacing={2} direction="row">
      <Button variant="contained">Contained</Button>


.MuiButton-contained  {
  font-size: 30px !important;

In the above code example, I have used the @mui/material component and changed mui button font size.

Check the output of the above code example.

React, Mui button font-size

All the best 👍

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