transition.js

function elementTransition(element, distX){
  document.styleSheets[0].insertRule(".transitioning{ transition: transform 100ms linear;"+
                                     "transform: translate(" + distX + "px, 0px);}");
  element.classList.add("transitioning");
  window.setTimeout((element)=>{
    if (distX<0){
      element.appendBefore(element.previousElementSibling);
      element.previousElementSibling.removeEventListener("mousemove", passedFunction);
    }
  }, 100);
}