Garmin connect, remove column4 and convert main column to 12

gistfile1.txt

const pageContent = document.getElementsByClassName('page-content');
const chidls = pageContent[0].childNodes;

for (let i = 0; i < chidls.length; i++) {
  if (chidls[i].className === 'span4') {
    let toRemove = chidls[7];
    toRemove.parentNode.removeChild(toRemove);
  }
  if (chidls[i].className === 'span8') {
    let element = chidls[i];
    element.classList.remove('span8');
    element.classList.add('span12')
  }
}