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HTML

              
                <body>
  <h1>WELCOME&nbsp;TO CHEMIE'S TRIVIA&nbsp;QUIZ!</h1>
  <p>Just click the option that you think is the correct answer to the question.</p><hr/><!--Hamburger Menu-->
  <span class="container">
      <span class="checkbox-container">
        <input class="checkbox-trigger" type="checkbox"  />
        <span class="menu-content">
            <ul>
					<li><a href="https://codepen.io/chemie/full/WojEdJ" target="_blank">HOME</a></li>
              <li><a href="https://codepen.io/chemie/full/zozvNE" target="_blank">HANGMAN</a></li>
              <li><a href="https://codepen.io/chemie/full/aBwvYG" target="_blank">MEMORY</a></li>
            </ul>
            <span class="hamburger-menu"></span>
  </span>
  </span>
  </span>
  <!--End of hamburger menu-->
  <button class="start" id="startbutton" onclick="startbutton()">Start</button>
  <center><img id="thinker" src="https://cdn.shopify.com/s/files/1/1061/1924/products/Thinking_Face_Emoji_grande.png?v=1469791175"/></center>
  <!-- Questions and Answers -->
  <div class="Questions" id="Question1">1. Mr Pibb was a soft drink made by the Coca-Cola company to rival what drink?</div>
    <button class="Answers Wrong One" id="q1a1" onclick="allAnswers1()">Sprite</button>
    <button class="Answers Wrong One" id="q1a2" onclick="allAnswers1()">Minute Maid</button>
    <button class="Answers Correct One" id="q1a3" onclick="allAnswers1();correctAnswer()">Dr. Pepper</button>
    <button class="Answers Wrong One" id="q1a4" onclick="allAnswers1()">Fanta</button>
  <div class="Questions" id="Question2">2. What is the name of the scale used the measure the spiciness of peppers?</div>
    <button class="Answers Correct Two" id="q2a1" onclick="allAnswers2();correctAnswer()">Scoville Scale</button>
    <button class="Answers Wrong Two" id="q2a2" onclick="allAnswers2()">Pepper Scale</button>
    <button class="Answers Wrong Two" id="q2a3" onclick="allAnswers2()">Spiciness Scale</button>
    <button class="Answers Wrong Two" id="q2a4" onclick="allAnswers2()">Zesty Scale</button>
  <div class="Questions" id="Question3">3. Pho is a popular noodle soup from what country?</div>
    <button class="Answers Wrong Three" id="q3a1" onclick="allAnswers3()">Thailand</button>
    <button class="Answers Correct Three" id="q3a2" onclick="allAnswers3();correctAnswer()">Vietnam</button>
    <button class="Answers Wrong Three" id="q3a3" onclick="allAnswers3()">Mongolia</button>
    <button class="Answers Wrong Three" id="q3a4" onclick="allAnswers3()">Malaysia</button>
  <div class="Questions" id="Question4">4. Red Vines is a popular brand of what kind of candy?</div>  
    <button class="Answers Correct Four" id="q4a1" onclick="allAnswers4();correctAnswer()">Red Licorice</button>
    <button class="Answers Wrong Four" id="q4a2" onclick="allAnswers4()">Sour Candy</button>
    <button class="Answers Wrong Four" id="q4a3" onclick="allAnswers4()">Candy Canes</button>
    <button class="Answers Wrong Four" id="q4a4" onclick="allAnswers4()">Red Chocolate Sticks</button>
  <div class="Questions" id="Question5">5. The taste that allows us to taste savoury food is called…</div>  
    <button class="Answers Wrong Five" id="q5a1" onclick="allAnswers5()">Salt</button>
    <button class="Answers Wrong Five" id="q5a2" onclick="allAnswers5()">Whiffler</button>
    <button class="Answers Correct Five" id="q5a3" onclick="allAnswers5();correctAnswer()">Umami</button>
    <button class="Answers Wrong Five" id="q5a4" onclick="allAnswers5()">Alginate</button>
  <div class="Questions" id="Question6">6. The paperboard “Chinese Takeout” was invented in what country?</div>
    <button class="Answers Wrong Six" id="q6a1" onclick="allAnswers6()">Taiwan</button>
    <button class="Answers Wrong Six" id="q6a2" onclick="allAnswers6()">China</button>
    <button class="Answers Wrong Six" id="q6a3" onclick="allAnswers6()">Britain</button>
    <button class="Answers Correct Six" id="q6a4" onclick="allAnswers6();correctAnswer()">United States</button>  
  <div class="Questions" id="Question7">7. Margarine is sold as a replacement of what?</div>
    <button class="Answers Wrong Seven" id="q7a1" onclick="allAnswers7()">Cheese</button>
    <button class="Answers Wrong Seven" id="q7a2" onclick="allAnswers7()">Jam</button>
    <button class="Answers Correct Seven" id="q7a3" onclick="allAnswers7();correctAnswer()">Butter</button>
    <button class="Answers Wrong Seven" id="q7a4" onclick="allAnswers7()">Marmalade</button>
  <div class="Questions" id="Question8">8. Chimichurri is a green sauce originated in what country?</div>
    <button class="Answers Wrong Eight" id="q8a1" onclick="allAnswers8()">Korea</button>
    <button class="Answers Wrong Eight" id="q8a2" onclick="allAnswers8()">Japan</button>
    <button class="Answers Correct Eight" id="q8a3" onclick="allAnswers8();correctAnswer()">Argentina</button>
    <button class="Answers Wrong Eight" id="q8a4" onclick="allAnswers8()">Kazakhstan</button>
  <div class="Questions" id="Question9">9. What is a traditional fermented Korean side dish made of seasoned vegetables and salt?</div>
    <button class="Answers Wrong Nine" id="q9a1" onclick="allAnswers9()">Samgyeopsal</button>
    <button class="Answers Wrong Nine" id="q9a2" onclick="allAnswers9()">Bingsu</button>
    <button class="Answers Wrong Nine" id="q9a3" onclick="allAnswers9()">Bulgogi</button>
    <button class="Answers Correct Nine" id="q9a4" onclick="allAnswers9();correctAnswer()">Kimchi</button>
  <div class="Questions" id="Question10">10. A teetotaler is a person that never drinks what?</div>
    <button class="Answers Correct Ten" id="q10a1" onclick="allAnswers10();correctAnswer()">Alcohol</button>
    <button class="Answers Wrong Ten" id="q10a2" onclick="allAnswers10()">Milk</button>
    <button class="Answers Wrong Ten" id="q10a3" onclick="allAnswers10()">Smoothies</button>
    <button class="Answers Wrong Ten" id="q10a4" onclick="allAnswers10()">Soft Drinks</button>
<br>
<br>
	<p id="preScore">Score:</p>
	<p id="theScore">0/10</p>
</body>
  

              
            
!

CSS

              
                /*Import Fonts*/
@import url('https://fonts.googleapis.com/css?family=Nunito|Poppins');

/*Styling body*/
body {
  background-color: #00ffcb; 
  color: black;
  font-family: 'Poppins', sans-serif;
  text-align: center;
}

/*Styling p*/
p {
	background-color: #00ffcb;
  color: black;
  font-family: 'Poppins', sans-serif;
  text-align: center;
}

/*Styling .questions*/
.Questions {
  background-color: #00ffcb; 
  color: black;
  font-family: 'Poppins', sans-serif;
  text-align: left;
}

/*Styling header*/
h1 {
  text-align: center;
  color: white;
  font-family: sans-serif;
  font-family: 'Nunito', sans-serif;
  font-weight: bold;
  text-shadow: 2px 2px #ff0083;
}

/*Styling buttons*/
#startbutton {
    font-family: 'Poppins', sans-serif;
    background-color: #ff0083;
    border: none;
    color: white;
    padding: 10px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
}

/*Styling images*/
#thinker {
  padding-top: 20px;
  height: 300px;
}

/*Styling Questions*/
.Questions{
  visibility: hidden;
}

/*Styling Answers*/
.Answers {
    font-family: 'Poppins', sans-serif;
    background-color: white;
    border: none;
    color: #ff0083;
    padding: 10px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 5px;
    visibility: hidden;
}

.Answers:hover {
  background-color: #ff0083;
  color: white;
}

.Answers:focus {
	background-color: #ff0083;
	color: white;
}

/*Scores*/
#preScore {
	visibility: hidden;
}

#theScore {
	visibility: hidden;
}
/*HAMBURGER MENU CSS*/
.checkbox-container {
  display: block;
  float: left;
  width: 50px;
  height: 50px;
  position: relative;
  background: #182825;
}

.checkbox-trigger {
  opacity: 0;
  position: absolute;
  width: 50px;
  height: 50px;
  left: 0px;
  cursor: pointer;
  z-index: 5;
}

.hamburger-menu,
.hamburger-menu::before,
.hamburger-menu::after {
  display: block;
  position: absolute;
  background: white;
  width: 40px;
  height: 4px;
  margin: 1.3em 3em;
  transition: background 0.3s;
}

.hamburger-menu::before,
.hamburger-menu::after {
  content: '';
  position: absolute;
  margin: -0.7em 0 0;
}

.hamburger-menu::after {
  margin-top: 0.7em;
}

.hamburger-menu {
  position: relative;
  display: block;
  margin: 0;
  margin-top: 1.45em;
  margin-right: 0.35em;
  margin-left: 0.35em;
  margin-bottom: 1.45em;
}

.checkbox-trigger:checked {
  left: 152px;
}

.checkbox-trigger:checked + .menu-content ul {
  width: 150px;
  height: 150px;
  ;
  transition: width 0.7s ease 0.3s, height 0.3s ease;
}

.menu-content {
  display: flex;
  background: #00ffcb;
  color: black;
  float: left;
}

.menu-content ul {
  display: block;
  padding-left: 0;
  padding-top: 1em;
  padding-bottom: 1em;
  margin: 0;
  width: 0px;
  height: 0px;
  overflow: hidden;
  transition: height 0.3s ease 0.7s, width 0.7s ease;
}

.menu-content ul li {
  list-style: none;
  padding-top: 1em;
  padding-bottom: 1em;
  cursor: pointer;
  text-align: center;
  font-family: Helvetica;
  transition: color 0.5s, background 0.5s;
}

.menu-content ul li a {
  color: #FF0083;
  text-decoration: none;
  padding-top: 15px;
  padding-bottom: 15px;
  padding-left: 50px;
  padding-right: 80px;
}

.menu-content ul li a:hover {
  color: white;
  background: black;
}

.menu-content ul li:hover {
  color: white;
  background: black;
}
/*END OF HAMBURGER MENU CSS*/


              
            
!

JS

              
                
  var numQuestions = document.getElementsByClassName("Questions");
  var numAnswers = document.getElementsByClassName("Answers");
  var question1Answers = document.getElementsByClassName("One");
  var question2Answers = document.getElementsByClassName("Two");
  var question3Answers = document.getElementsByClassName("Three");
  var question4Answers = document.getElementsByClassName("Four");
  var question5Answers = document.getElementsByClassName("Five");
  var question6Answers = document.getElementsByClassName("Six");
  var question7Answers = document.getElementsByClassName("Seven");
  var question8Answers = document.getElementsByClassName("Eight");
  var question9Answers = document.getElementsByClassName("Nine");
  var question10Answers = document.getElementsByClassName("Ten");
  var startClass = document.getElementById("startbutton").className;
  var submitButton = document.getElementById("submitanswers");
function startbutton() {
  if (startClass == "start") {
    document.getElementById("thinker").style.width = "0px";
    document.getElementById("thinker").style.height = "0px";
	 document.getElementById("startbutton").style.visibility = "hidden";
	 document.getElementById("preScore").style.visibility = "visible";
	 document.getElementById("theScore").style.visibility = "visible";
    document.getElementById("Question1").style.visibility = "visible";
    for (var i = 0; i < question1Answers.length; i++) {
      question1Answers[i].style.visibility = "visible";
    }
  } 
}

function allAnswers1(){	
	document.getElementsByClass("One").disabled = "true";
	document.getElementsByClass("Two").style.visibiliy = "true";
	document.getElementById("Question2").style.visibility = "true";
}

function allAnswers2(){
	document.getElementsByClass("Two").disabled = "true";	
	document.getElementsByClass("Three").style.visibility = "true";
	document.getElementById("Question3").style.visibility = "true";
}

function allAnswers3(){
	document.getElementsByClass("Three").disabled = "true";
	document.getElementsByClass("Four").style.visibility = "true";
	document.getElementById("Question4").style.visibility = "true";
}

function allAnswers4(){
	document.getElementsByClass("Four").disabled = "true";
	document.getElementsByClass("Five").style.visibility = "true";
	document.getElementById("Question5").style.visibility = "true";
}

function allAnswers5(){
	document.getElementsByClass("Five").disabled = "true";
	document.getElementsByClass("Six").style.visibility = "true"
	document.getElementById("Question6").style.visibility = "true";
}

function allAnswers6(){
	document.getElementsByClass("Six").disabled = "true";
	document.getElementsByClass("Seven").style.visibility = "true";
	document.getElementById("Question7").style.visibility = "true";
}

function allAnswers7(){
	document.getElementsByClass("Seven").disabled = "true";
	document.getElementsByClass("Eight").style.visibility = "true";
	document.getElementById("Question8").style.visibility = "true";
}

function allAnswers8(){
	document.getElementsByClass("Eight").disabled = "true";
	document.getElementsByClass("Nine").style.visibility = "true";
	document.getElementById("Question9").style.visibility = "true";
}

function allAnswers9(){
	document.getElementsByClass("Nine").disabled = "true";
	document.getElementsByClass("Ten").style.visibility = "true";
	document.getElementById("Question10").style.visibility = "true";
}

function allAnswers10(){
	document.getElementsByClass("Ten").disabled = "true";
	document.getElementsByClass("Correct").style.backgroundColor = "green";
	document.getElementsByClass("Wrong").style.backgroundColor = "red";
}

function correctAnswer(){
	var score = score + 1;
	document.getElementById("theScore").innerHTML = score + "/10"
}
              
            
!
999px

Console