const heightBox = document.querySelector("#h")

const bmiSpan = document.querySelector("#bmi")

​

weightBox.addEventListener('input', updateBMI)

heightBox.addEventListener('input', updateBMI)

​

function updateBMI() {

  const weight = weightBox.value

  const height = heightBox.value

  bmiSpan.textContent = weight / (height ** 2)

}

​

bmiSpan.addEventListener('click', () => {

  document.body.style.opacity = 0

  document.body.style.transition = '5s'

})