How to style material-ui textfield

You need to add the InputProps property to the TextField.

const styles = theme => ({
    textField: {
        width: '90%',
        marginLeft: 'auto',
        marginRight: 'auto',            
        paddingBottom: 0,
        marginTop: 0,
        fontWeight: 500
    },
    input: {
        color: 'white'
    }
});

JSX:

<TextField
    id="email"
    label="Email"
    className={classes.textField}
    value={this.state.form_email}
    onChange={this.handle_change('form_email')}
    margin="normal"
    InputProps={{
        className: classes.input,
    }}
/>

As an aside, you can also style the label or use an override as described here.

All the answers here shows how to style things with InputProps or inputProps, but no one explained why, and how it works. And no one explained whats the difference between inputProps and InputProps

<TextField    
    variant="outlined"
    // inputProps are used to pass attributes native to the underlying 
    // HTML input element, e.g. name, id, style.
    inputProps={{
      style: { textAlign: 'center' },
    }

    // InputProps (capital I) passes props to the wrapper Material 
    // component. Can be  one of the following: Input, FilledInput, 
    // OutlinedInput. You can pass here anything that the underlying
    // Material component uses: error, value, onChange, and classes.
    InputProps={{
       // Usually you don't need className, the `classes` object will
       // be sufficient. However, you can also use it and this will
       // add your class to the div of the InputBase.
       className: styles.slider_filter_input, 
       classes: {
          root: classes.root
          focused: classes.focused
          // The list of keys you pass here depend on your variant
          // If for example you used variant="outlined", then you need
          // to check the CSS API of the OutlinedInput.
       }
    }}
/>

Here is a working codesandbox showing the ideas above.

This is a solution with inline styles:

<TextField
    style={{
        backgroundColor: "blue"
    }}
    InputProps={{
        style: {
            color: "red"
        }
    }}
/>

I'd suggest keeping your style within a theme.

const theme = createMuiTheme({
  overrides: {
    MuiInputBase: {
      input: {
        background: "#fff",
      },
    },
  },
});

It really depends on what exactly are you trying to change.

The documentation has a bunch of examples on custom TextFields, take a look at them here:

https://material-ui.com/demos/text-fields/#customized-inputs

More information about customization can be found here:

https://material-ui.com/customization/overrides/

and

https://material-ui.com/customization/themes/

Have you tried using !important for the color changes? I had the same problem when I tried to set a default color for the border of an outlined TextField

Take a look at this: https://stackblitz.com/edit/material-ui-custom-outline-color

How to style material-ui textfield

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