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To alter the input style in a React hook form, follow these steps:

1. Define the style properties you want to add, such as color, font-size, and padding.

2. Use the "useController" hook provided by React hook form to access the controller object for each input.

3. Add the style properties to the "style" attribute of the input element.

4. If you want to apply the same style to multiple inputs, create a custom hook or function that uses the "useController" hook and applies the style.

For example, to change the font size of all input elements to 16px, you could define a custom hook like this:

import { useController } from 'react-hook-form';

function useInputStyle() {
  const { field } = useController();
  return {
    style: {
      fontSize: '16px',
      ...field.style,
    },
  };
}

Then, when defining your input elements, you can use the "style" attribute to apply the font size:

import { useInputStyle } from './useInputStyle';

function MyForm() {
  const { style } = useInputStyle();

  return (
    <form>
      <label>
        Name:
        <input {...style} type="text" name="name" />
      </label>
      <label>
        Email:
        <input {...style} type="email" name="email" />
      </label>
    </form>
  );
}