如何在样式表create中使用useTheme钩子？

import { useTheme } from '@emotion/react';

const theme = useTheme();

const primaryColor = theme.colors.primary;
const fontSize = theme.fontSizes.medium;

import { css } from '@emotion/react';

const buttonStyles = css`
  background-color: ${theme.colors.primary};
  color: ${theme.colors.text};
  border: none;
  padding: 10px 20px;
  font-size: ${theme.fontSizes.medium};
`;

function MyButton() {
  const theme = useTheme();

  return (
    <button css={buttonStyles}>
      My Button
    </button>
  );
}