Scrollable react-modal's within Next.js

index.js

// ...

const [modalOpen, setModalOpen] = useState(false)

<Modal
  isOpen={modalOpen}
  onRequestClose={() => setModalOpen(false)}
  setModalOpen={setModalOpen}
>
  <div>
    <h1>Ayy</h1>
    <p>Yoo</p>
  </div>
</Modal>

// ...

Modal.css.js

import { css } from '@emotion/core'
import styled from '@emotion/styled'
import ReactModal from 'react-modal'

ReactModal.setAppElement('#__next')
ReactModal.defaultStyles = {}

export const globalStyles = css`
  .ReactModal__Html--open,
  .ReactModal__Body--open {
    overflow: hidden;
  }

  .ReactModal__Overlay {
    position: fixed;
    z-index: 999999;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .ReactModal__Content {
    background: white;
    outline: none;
    width: 50rem;
    max-width: calc(100vw - 2rem);
    max-height: calc(100vh - 2rem);
    box-shadow: 0 0 34px 0 rgba(0, 0, 0, 0.24);
    overflow-y: auto;
    position: relative;
  }
`

export const S = styled(ReactModal)`
  .modal-close-btn {
    cursor: pointer;
    top: 1.5rem;
    right: 1.5rem;
    position: absolute;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    background: none;
    border: 0;
    outline: none;
    transition: all 200ms ease;

    &:hover,
    &:focus {
      background: rgba(0, 0, 0, 0.05);
    }
  }

  .modal-content {
    min-height: 6rem;
    padding: 4.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;

    > * {
      width: 100%;
    }
  }
`

Modal.js

import { Global } from '@emotion/core'
import { faTimes } from '@fortawesome/pro-light-svg-icons'
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
import { globalStyles, S } from './Modal.css'

const Modal = props => {
  const { setModalOpen, children } = props

  return (
    <S {...props}>
      <Global styles={globalStyles} />

      <button className="modal-close-btn" onClick={() => setModalOpen(false)}>
        <FontAwesomeIcon icon={faTimes} />
      </button>

      <div className="modal-content">{children}</div>
    </S>
  )
}

export default Modal