The other popular answer (by André Junges) on this question is for the 0.x versions of Material-UI. Below I've copied in my answer from Material UI's Tooltip - Customization Style which addresses this for v3 and v4. Further down, I have added a version of the example using v5.
Below are examples of how to override all tooltips via the theme, or to just customize a single tooltip using withStyles (two different examples). The second approach could also be used to create a custom tooltip component that you could reuse without forcing it to be used globally.
import React from "react";
import ReactDOM from "react-dom";
import {
createMuiTheme,
MuiThemeProvider,
withStyles
} from "@material-ui/core/styles";
import Tooltip from "@material-ui/core/Tooltip";
const defaultTheme = createMuiTheme();
const theme = createMuiTheme({
overrides: {
MuiTooltip: {
tooltip: {
fontSize: "2em",
color: "yellow",
backgroundColor: "red"
}
}
}
});
const BlueOnGreenTooltip = withStyles({
tooltip: {
color: "lightblue",
backgroundColor: "green"
}
})(Tooltip);
const TextOnlyTooltip = withStyles({
tooltip: {
color: "black",
backgroundColor: "transparent"
}
})(Tooltip);
function App(props) {
return (
<MuiThemeProvider theme={defaultTheme}>
<div className="App">
<MuiThemeProvider theme={theme}>
<Tooltip title="This tooltip is customized via overrides in the theme">
<div style={{ marginBottom: "20px" }}>
Hover to see tooltip customized via theme
</div>
</Tooltip>
</MuiThemeProvider>
<BlueOnGreenTooltip title="This tooltip is customized via withStyles">
<div style={{ marginBottom: "20px" }}>
Hover to see blue-on-green tooltip customized via withStyles
</div>
</BlueOnGreenTooltip>
<TextOnlyTooltip title="This tooltip is customized via withStyles">
<div>Hover to see text-only tooltip customized via withStyles</div>
</TextOnlyTooltip>
</div>
</MuiThemeProvider>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
Here is documentation on tooltip CSS classes available to control different aspects of tooltip behavior: https://material-ui.com/api/tooltip/#css
Here is documentation on overriding these classes in the theme: https://material-ui.com/customization/components/#global-theme-override
Here is a similar example, but updated to work with v5 of Material-UI:
import React from "react";
import ReactDOM from "react-dom";
import { createTheme, ThemeProvider, styled } from "@material-ui/core/styles";
import Tooltip, { tooltipClasses } from "@material-ui/core/Tooltip";
const defaultTheme = createTheme();
const theme = createTheme({
components: {
MuiTooltip: {
styleOverrides: {
tooltip: {
fontSize: "2em",
color: "yellow",
backgroundColor: "red"
}
}
}
}
});
const BlueOnGreenTooltip = styled(({ className, ...props }) => (
<Tooltip {...props} classes={{ popper: className }} />
))(`
& .${tooltipClasses.tooltip} {
color: lightblue;
background-color: green;
font-size: 1.5em;
}
`);
const TextOnlyTooltip = styled(({ className, ...props }) => (
<Tooltip {...props} classes={{ popper: className }} />
))(`
& .${tooltipClasses.tooltip} {
color: black;
background-color: transparent;
}
`);
function App(props) {
return (
<ThemeProvider theme={defaultTheme}>
<div className="App">
<ThemeProvider theme={theme}>
<Tooltip title="This tooltip is customized via overrides in the theme">
<div style={{ marginBottom: "20px" }}>
Hover to see tooltip customized via theme
</div>
</Tooltip>
</ThemeProvider>
<BlueOnGreenTooltip title="This tooltip is customized via styled">
<div style={{ marginBottom: "20px" }}>
Hover to see blue-on-green tooltip customized via styled
</div>
</BlueOnGreenTooltip>
<TextOnlyTooltip title="This tooltip is customized via styled">
<div>Hover to see text-only tooltip customized via styled</div>
</TextOnlyTooltip>
</div>
</ThemeProvider>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
Documentation on changes to the theme structure between v4 and v5: https://next.material-ui.com/guides/migration-v4/#theme
Tooltip customization examples in the Material-UI documentation: https://next.material-ui.com/components/tooltips/#customized-tooltips
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