insert calculatorsoup into all positive physics assignments

PositivePhysics.js

// ==UserScript==
// @name         Positive Physics CalculatorSoup embed
// @version      1.1
// @description  Embeds CalculatorSoup into Positive Physics
// @author       ollinruiz
// @match        https://www.positivephysics.org/positiveskill*
// @grant        none
// @run-at       document-end
// @require      https://code.jquery.com/jquery-3.6.0.js
// @require      https://code.jquery.com/ui/1.13.1/jquery-ui.js
// ==/UserScript==

var dragBox = document.createElement("div");
var iframe = document.createElement("iframe");

iframe.style.width = "100%";
iframe.style.height = "300px"
iframe.src = "https://www.calculatorsoup.com/calculators/physics/";

dragBox.id = "frame";
dragBox.title = "Calculator Soup";

dragBox.style.display = "none"

//https://stackoverflow.com/questions/42272593/draggable-iframe-registers-click-instead-of-drag
/*
$(".draggable").draggable({
    iframeFix: true
});

$('.btn-drag, .btn-play').click(function(){
  if($(this).hasClass('btn-drag')){
    $('.btn-drag').addClass('active');
    $('.btn-play').removeClass('active');
    $('#frame').css('pointer-events','none');
  }
  else{
    $('.btn-drag').removeClass('active');
    $('.btn-play').addClass('active');
    $('#frame').css('pointer-events','auto');
  }
});
*/

//var dialog = $("#frame").dialog();


document.addEventListener("keydown", function (e) {  
  if(!e.shiftKey){
    return false;
  }
  if(document.getElementById("frame").style.display === 'none'){
    //$('.btn-drag, .btn-play').toggleClass('active');
    document.getElementById("frame").style.display = 'block';
  }
  else{
    //$('.btn-play, .btn-drag').toggleClass('active');
    document.getElementById("frame").style.display = 'none';
  }
});

dragBox.appendChild(iframe);
$("#pageContent").append(dragBox);

1.1: moved the iframe into the problem tag and added a key (shift) to open and hide it