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HTML 

              
                <!-- Code By Sofia Silva -->
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link href="style.css" rel="stylesheet"></link>
  <link href="https://fonts.googleapis.com/css?family=Annie+Use+Your+Telescope|Jim+Nightshade|Pangolin" rel="stylesheet">
  <title>"Mad Libs" Harry Potter edition</title>
</head>

<body>
  <div class="Container">
    <h1>"Mad Libs"<span class="scar"><img  src="https://s15.postimg.cc/pk0nzkuy3/bolt.png" alt="scar icon"></span>Harry Potter edition</h1>
    <form id="formContent">
      <div class="row">
        <div class="column">
          Verb in past tense: <input id="livedReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br> 
          Number: <input id="number4Replacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Noun: <input id="driveReplacer"
            onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Adjective: <input id="normalReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Adjective: <input id="strangeReplacer" onchange="displayChanges()" type="text"
            autocomplete="off" /><br>
          Adjective: <input id="mysteriousReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Verb in First Person: <input id="holdReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br> 
          Made-up Name: <input id="grunningsReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
        </div>

        <div class="column">
          Object Plural: <input id="drillsReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br> Adjective: <input id="beefyReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Body Part: <input id="neckReplacer"
            onchange="displayChanges()" type="text" autocomplete="off" /><br> Adjective: <input id="largeReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Adjective: <input id="thinReplacer" onchange="displayChanges()" type="text"
            autocomplete="off" /><br>
          Verb -ing: <input id="craningReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
          Adjective: <input id="smallReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br> 
          Noun: <input
            id="secretReplacer" onchange="displayChanges()" type="text" autocomplete="off" /><br>
        </div>
      </div>
      <input id="submit" class="button" value="Submit" type="submit"><br>
    </form>
    <button id="seeOriginal" class="button unToggled">Compare to Original</button>
    <!-- <button class="button refresh" onClick="window.location.reload()">Another!</buttom> -->

    <div class="finalTextContainer">
      <h2>The Boy Who <span class="lived">Lived</span></h2>
      <p class="textContent">Mr and Mrs Dursley, of number <span class="number4">4</span>, Private <span class="drive">Drive</span>, were proud to say that they were perfectly <span class="normal">normal</span>, thank you very much. They were the last people you'd expect to
        be involved in anything <span class="strange">strange</span> or <span class="mysterious">mysterious</span>, because they just didn't <span class="hold">hold</span> with such nonsense.</p>

      <p class="textContent">Mr Dursley was the director of a firm called <span class="grunnings"> Grunnings</span>, which made <span class="drills">drills</span>. He was a big, <span class="beefy">beefy</span> man with hardly any <span class="neck">neck</span>, although he
        did have a very <span class="large">large</span> moustache. Mrs Dursley was <span class="thin">thin</span> and blonde and had nearly twice the usual amount of <span class="secondNeck">neck</span>, which came in very useful as she spent so much
        of her time <span class="craning">craning</span> over garden fences, spying on the neighbours. The Dursleys had a <span class="small">small</span> son called Dudley and in their opinion there was no finer boy anywhere.</p>

      <p class="textContent">The Dursleys had everything they wanted, but they also had a <span class="secret">secret</span>, and their greatest fear was that somebody would discover it. They didn't think they could bear it if anyone found out about the Potters.</p>
    </div>
    <div class="originalTextContainer">
      <h2>The Boy Who <span>Lived</span></h2>
      <p class="textContent">Mr and Mrs Dursley, of number <span>4</span>, Private <span style="text-transform: capitalize;">Drive</span>, were proud to say that they were perfectly <span>normal</span>, thank you very much. They were the last people you'd expect to be involved
        in anything <span>strange</span> or <span>mysterious</span>, because they just didn't <span>hold</span> with such nonsense.</p>

      <p class="textContent">Mr Dursley was the director of a firm called <span style="text-transform: capitalize;"> Grunnings</span>, which made <span>drills</span>. He was a big, <span>beefy</span> man with hardly any <span>neck</span>, although he did have a very <span>large</span>        moustache. Mrs Dursley was <span>thin</span> and blonde and had nearly twice the usual amount of <span>neck</span>, which came in very useful as she spent so much of her time <span>craning</span> over garden fences, spying on the neighbours. The
        Dursleys had a <span>small</span> son called Dudley and in their opinion there was no finer boy anywhere.</p>

      <p class="textContent">The Dursleys had everything they wanted, but they also had a <span>secret</span>, and their greatest fear was that somebody would discover it. They didn't think they could bear it if anyone found out about the Potters.</p>
    </div>
  </div>
  <footer>
    <p>Coded by <a href="https://github.com/sofiabsilva">Sofia Silva</a>, original text from "Harry Potter and the Philosopher's Stone" by JK Rowling, background by <a href="https://bamberos.deviantart.com/">Bamberos</a></p>
    <div>Icon made by <a href="https://www.flaticon.com/authors/smashicons" title="Smashicons">Smashicons</a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com</a> is licensed by <a href="http://creativecommons.org/licenses/by/3.0/" title="Creative Commons BY 3.0" target="_blank">CC 3.0 BY</a></div>
  </footer>
  <script src="script.js"></script>
</body>

</html>
!

CSS 

              
                /* Code by Sofia Silva */
body {
  color: white;
  background-color: #5c3236;
  font-family: 'Pangolin', cursive;
  /* font-family: 'Annie Use Your Telescope', cursive;
  font-family: 'Princess Sofia', cursive;
  font-family: 'Jim Nightshade', cursive;
  font-family: 'Pangolin', cursive; */
  font-size: 20px;
  background-image: url('https://i.postimg.cc/ZqmcPy10/harry-potter-desk-wallpaper-by-bamberos-compressed.jpg');
  /* background-image: url('https://orig00.deviantart.net/0d65/f/2013/033/e/2/ron_weasley_desk_wallpaper_and_gmail_theme_by_bamberos-d5tmnbs.jpg'); */
  /* background-image: url('https://orig00.deviantart.net/4dcd/f/2008/035/3/7/harry_potter_desk_wallpaper_by_emelody.jpg'); */
  background-size: cover;
  background-position: bottom;
  background-attachment: fixed;
}

h1 {
font-family: 'Jim Nightshade', cursive;
}
.scar img{
  padding: 2px;
  max-width: 50px;
  position: relative;
  top: 20px;

}
.row {
  display: flex;
}
.column {
  flex: 50%;
  text-align: center;
  flex-wrap: wrap;
}
.button {
  background-color: #ffffff0f;
  color: white;
  font-size: 19px;
  border: 2px solid #e7e7e7;
  height: 40px;
  min-width: 150px;
}
.button:hover {
  font-weight: bold;
  border: 2px solid #e7e7e7;
}
input, button {
   display: block;
   margin: auto;
   text-align: center;
}

 #seeOriginal{
  display: none;
}
input[type=text] {
  padding: 6px;
  font-size: 18px;
  margin-top: 5px;
  border-radius: 4px;
}
h1, h2 {
    text-align: center;
}

div.Container {
  display: block;
  width: 70%;
  max-width: 800px;
  margin: auto;
  background-color: #29191a;
  background-color: #29191ae6;
  padding: 15px;
  border-radius: 15px;
}
.finalTextContainer {
  display: none;
}
.originalTextContainer {
  display: none;
}
.textContent {
  padding: 10px;
  margin: auto;
  line-height: 1.6em;
  text-indent: 50px;
}
span {
    text-decoration: underline;
    text-transform: lowercase;
}
.scar {
   text-decoration: none;
}

h2 span, .grunnings, .drive {
  text-transform: capitalize;
}
footer {
    text-align: center;
    font-size: 16px;
    text-shadow: 1px 1px 2px black, 0 0 1em black, 0 0 0.2em black;
}
a {
  color: white;
  text-decoration: none;
  line-height: 1.6em;
}
a:hover {
  text-decoration: underline;
}
@media screen and (max-width: 850px){
  div.Container {
    display: block;
    width: 80%;
    max-width: 800px;
    padding: 5px;
    border-radius: 15px;
    font-size: 17px;
  }
}
@media screen and (max-width: 720px){
  .row {
  display: block;
  }
  h1 {
    font-size: 1.9em;
  }
  h2 {
    font-size: 1.5em;
  }
  div.Container {
      width: 90%;
  }
  body {
    background-repeat: no-repeat;
    background-size: cover;
  }
}
@media screen and (min-width: 1060px){
  div.Container {
    width: 50%;
  }
}
!

JS 

              
                // Code by Sofia Silva
function displayChanges() {
   var livedReplacer = document.getElementById("livedReplacer");
   var number4Replacer = document.getElementById("number4Replacer");
   var driveReplacer = document.getElementById("driveReplacer");
   var normalReplacer = document.getElementById("normalReplacer");
   var strangeReplacer = document.getElementById("strangeReplacer");
   var mysteriousReplacer = document.getElementById("mysteriousReplacer");
   var holdReplacer = document.getElementById("holdReplacer");
   var grunningsReplacer = document.getElementById("grunningsReplacer");
   var drillsReplacer = document.getElementById("drillsReplacer");
   var beefyReplacer = document.getElementById("beefyReplacer");
   var neckReplacer = document.getElementById("neckReplacer");
   var largeReplacer = document.getElementById("largeReplacer");
   var thinReplacer = document.getElementById("thinReplacer");
   var craningReplacer = document.getElementById("craningReplacer");
   var smallReplacer = document.getElementById("smallReplacer");
   var secretReplacer = document.getElementById("secretReplacer");

  /*  var newLived = document.getElementsByClassName("lived")[0];
  // got to use [0] beacause it is getting the ElementsByClassName as an array!
   it's better to use querySelector(".classname")*/
    var newLived = document.querySelector(".lived");
    var newNumber4 = document.querySelector(".number4");
    var newDrive = document.querySelector(".drive");
    var newNormal = document.querySelector(".normal");
    var newStrange = document.querySelector(".strange");
    var newMysterious = document.querySelector(".mysterious");
    var newHold = document.querySelector(".hold");
    var newGrunnings = document.querySelector(".grunnings");
    var newDrills = document.querySelector(".drills");
    var newBeefy = document.querySelector(".beefy");
    var newNeck = document.querySelector(".neck");
    var newLarge = document.querySelector(".large");
    var newThin = document.querySelector(".thin");
    var new2Neck = document.querySelector(".secondNeck");
    var newCraning = document.querySelector(".craning");
    var newSmall = document.querySelector(".small");
    var newSecret = document.querySelector(".secret");

    newLived.innerText = livedReplacer.value;
    newNumber4.innerText = number4Replacer.value;
    newDrive.innerText = driveReplacer.value;
    newNormal.innerText = normalReplacer.value;
    newStrange.innerText = strangeReplacer.value;
    newMysterious.innerText = mysteriousReplacer.value;
    newHold.innerText = holdReplacer.value;
    newGrunnings.innerText = grunningsReplacer.value;
    newDrills.innerText = drillsReplacer.value;
    newBeefy.innerText = beefyReplacer.value;
    newNeck.innerText = neckReplacer.value;
    newLarge.innerText = largeReplacer.value;
    newThin.innerText = thinReplacer.value;
    new2Neck.innerText = neckReplacer.value;
    newCraning.innerText = craningReplacer.value;
    newSmall.innerText = smallReplacer.value;
    newSecret.innerText = secretReplacer.value;
}
var submitButton = document.getElementById("submit");
var finalTextContainer = document.querySelector(".finalTextContainer");
submitButton.addEventListener('click', function(e){
  if (document.querySelector("input").value === "") {
    alert("Make sure to fill all the boxes");
  } else {
    var formContent = document.querySelector("#formContent");
    var seeOriginalButton = document.querySelector("#seeOriginal");
    finalTextContainer.style = 'display: block';
    formContent.style = 'display: none';
    seeOriginalButton.style ='display: block';
    e.preventDefault();
  }
});

var seeOriginalButton = document.querySelector("#seeOriginal");
var originalTextContainer = document.querySelector(".originalTextContainer");
  seeOriginalButton.addEventListener('click', function() {
  if (seeOriginalButton.className === "button unToggled") {
    originalTextContainer.style = 'display: block';
    finalTextContainer.style = 'display: none';
    seeOriginalButton.innerText = "Go Back";
    seeOriginalButton.classList.toggle("unToggled");
  } else {
    originalTextContainer.style = 'display: none';
    finalTextContainer.style = 'display: block';
    seeOriginalButton.classList.toggle("unToggled");
    seeOriginalButton.innerText = "Compare to Original";
  }
});
!
999px

Console