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HTML

              
                #app
              
            
!

CSS

              
                #app
  min-height 100vh
  background #663399
  display flex
  align-items center
  justify-content center
  
button
  padding 8px 16px
  border-radius 4px
  
  
.modal
  position fixed
  top 50%
  left 50%
  transform translate(-50%, -50%) scale(0)
  animation show .25s ease forwards
  z-index 2
  background #fafafa
  padding 1rem
  min-height 200px
  min-width 200px
  display flex
  align-items center
  justify-content center
  
  
  &__close
    position absolute
    top 4px
    right 4px
    font-size 1.25rem
    font-weight bold
  
@keyframes show
  to
    transform translate(-50%, -50%) scale(1)
              
            
!

JS

              
                const { React, ReactDOM } = window
const { useState, Fragment } = React
const { createPortal, render } = ReactDOM
const Outsider = () => createPortal(<h1>Hello</h1>, document.body)


const Modal = ({ children, onClose, open }) =>
  open ?
    createPortal(
      <div className='modal'>
        <button onClick={onClose} className='modal__close'>&times;</button>
        {children}
      </div>,
    document.body)
    : null

const App = () => {
  const [open, setOpen] = useState(false)
  return (
    <Fragment>
    <button onClick={() => setOpen(!open)}>Show Modal?</button>
      <Modal open={open} onClose={() => setOpen(false)}>
        Test Modal
      </Modal>
    </Fragment>
  )
}
  

render(<App/>, document.getElementById('app'))
              
            
!
999px

Console