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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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HTML 

              
                <div class="grid">
    <div id="quiz" class="centered grid__col--8">
        <h1>Awesome Quiz</h1>

        <h2 id="question" class="headline-secondary--grouped"></h2>

        
        <button id="guess0" class="btn--default"><p id="choice0"></p></button>

        
        <button id="guess1" class="btn--default"><p id="choice1"></p></button>

       
        <button id="guess2" class="btn--default"> <p id="choice2"></p></button>

        
        <button id="guess3" class="btn--default"><p id="choice3"></p></button>

        <footer>
            <ol id="progress">Question x of y</ol>
        </footer>
    </div>
</div>
!

CSS 

              
                @import url("http://fonts.googleapis.com/css?family=Lato:100,300,400,700,900");

.pagination{
  background: #ffffff;
  color: #fff;
  border: 1px solid #0c40d4;
  opacity: 1;
  width: 20px;
  height: 20px;
  margin: 0 3.75px;
  border-radius: 50%;
  display: inline-block;
}
li.active {
  background: #ff784f;
}
.grid:after {
  content: "";
  display: table;
  clear: both; }

.srt, .form__label--hidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px; }

.panel--centered, .panel--padded--centered, [class^="btn--"] {
  text-align: center; }

[class^="progbar__"]:after, .icn--nav-toggle:before {
  display: block;
  content: '';
  position: absolute; }

.centered, .grid {
  float: none;
  margin-left: auto;
  margin-right: auto; }

html {
  font-family: sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding-top: 2.5em; }

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
  display: block; }

audio,
canvas,
progress,
video {
  display: inline-block;
  vertical-align: baseline; }

audio:not([controls]) {
  display: none;
  height: 0; }

[hidden],
template {
  display: none; }

a {
  background: transparent; }

a:active,
a:hover {
  outline: 0; }

abbr[title] {
  border-bottom: 1px dotted; }

b,
strong {
  font-weight: bold; }

dfn {
  font-style: italic; }

h1 {
  font-size: 2em;
  margin: 0.67em 0; }

mark {
  background: #ff0;
  color: #000; }

small {
  font-size: 80%; }

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline; }

sup {
  top: -0.5em; }

sub {
  bottom: -0.25em; }

img {
  border: 0; }

svg:not(:root) {
  overflow: hidden; }

figure {
  margin: 1em 40px; }

hr {
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  height: 0; }

pre {
  overflow: auto; }

code,
kbd,
pre,
samp {
  font-family: monospace, monospace;
  font-size: 1em; }

button,
input,
optgroup,
select,
textarea {
  color: inherit;
  font: inherit;
  margin: 0; }

button {
  overflow: visible; }

button,
select {
  text-transform: none; }

button,
html input[type="button"],
input[type="reset"],
input[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer; }

button[disabled],
html input[disabled] {
  cursor: default; }

button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0; }

input {
  line-height: normal; }

*
input[type="checkbox"],
input[type="radio"] {
  box-sizing: border-box;
  padding: 0; }

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  height: auto; }

input[type="search"] {
  -webkit-appearance: textfield;
  -moz-box-sizing: content-box;
  -webkit-box-sizing: content-box;
  box-sizing: content-box; }

input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none; }

fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em; }

legend {
  border: 0;
  padding: 0; }

textarea {
  overflow: auto; }

optgroup {
  font-weight: bold; }

table {
  border-collapse: collapse;
  border-spacing: 0; }

td,
th {
  padding: 0; }

* {
  -moz-box-sizing: border-box;
  box-sizing: border-box; }

body {
  color: #797e83;
  font-size: 16px;
  font-family: "Lato", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.5; }

h3 {
  font-size: 1.125em; }

h4 {
  margin-top: 1.375em;
  margin-bottom: 2.57143em;
  color: #d6d7d9;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 400;
  font-size: 0.875em; }
  @media (min-width: 769px) {
    h4 {
      margin-top: 2.625em; } }

a {
  color: #656a6e;
  text-decoration: none;
  font-weight: 400; }

p {
  margin: .8em 0;
  font-weight: 300;
  font-size: 1.125em;
  line-height: 1.5; }

blockquote {
  font-weight: 300;
  font-style: italic;
  font-size: 1.25em; }
  @media (min-width: 769px) {
    blockquote {
      margin: 1.33333em 0;
      padding: 0 0 0 5%;
      border-left: 0.33333em solid #ebecec;
      font-size: 1.5em; } }

ul,
li {
  margin: 0;
  padding: 0;
  list-style-type: none; }

img {
  margin-bottom: 1.5em;
  max-width: 100%;
  height: auto; }

input,
textarea {
  display: block;
  padding: 15px;
  width: 100%;
  outline: 0;
  border: 0; }

input:focus,
textarea:focus {
  transition: 0.3s; }

button {
  outline: 0; }

footer {
  border-top: 1px solid #ebecec;
  margin-top: 1.375em; }
  footer p {
    font-size: 1em;
    margin-top: 1.375em; }

.panel, .panel--centered {
  padding-top: 1.875em; }
  @media (min-width: 769px) {
    .panel, .panel--centered {
      padding-bottom: 1.25em; } }

.panel--padded, .panel--padded--centered {
  padding-top: 2.125em; }
  @media (min-width: 769px) {
    .panel--padded, .panel--padded--centered {
      padding-top: 5em;
      padding-bottom: 2.125em; } }

.grid {
  width: 90%; }
  [class*="grid__col--"] > .grid {
    width: 100%; }
  @media (min-width: 1100px) {
    .grid {
      max-width: 1050px; } }

@media (min-width: 769px) {
  .grid__col--1 {
    width: 6.5%; }
  .grid__col--2 {
    width: 15%; }
  .grid__col--3 {
    width: 23.5%; }
  .grid__col--4 {
    width: 32%; }
  .grid__col--5 {
    width: 40.5%; }
  .grid__col--6 {
    width: 49%; }
  .grid__col--7 {
    width: 57.5%; }
  .grid__col--8 {
    width: 66%; }
  .grid__col--9 {
    width: 74.5%; }
  .grid__col--10 {
    width: 83%; }
  .grid__col--11 {
    width: 91.5%; }
  .grid__col--12 {
    width: 100%; } }

@media (min-width: 1px) and (max-width: 768px) {
  [class^="grid__col--"] {
    margin-top: 0.75em;
    margin-bottom: 0.75em; } }
@media (min-width: 769px) {
  [class^="grid__col--"] {
    float: left;
    min-height: 1px;
    padding-left: 10px;
    padding-right: 10px; }
    [class^="grid__col--"] + [class^="grid__col--"] {
      margin-left: 2%; }
    [class^="grid__col--"]:last-of-type {
      float: right; } }

.theme__poly .grid [class*="grid__col"] {
  font-weight: 100;
  margin-bottom: 1em;
  padding: 1.75%; }

@media (min-width: 769px) {
  .nav__item, .nav__item--current {
    display: inline-block;
    margin: 0 0.625em; } }

.nav__item--current a, .nav__item a {
  font-weight: 300;
  text-align: center;
  font-size: 1.125em;
  display: block;
  padding: 0.4em;
  border-bottom: 1px solid transparent; }
  @media (min-width: 1px) and (max-width: 768px) {
    .nav__item--current a, .nav__item a {
      border-bottom-color: #ebecec;
      padding-top: 0.77778em;
      padding-bottom: 0.77778em; } }

.nav__item--current a, .nav__item a:hover {
  color: #0b0b0b;
  border-color: #52bab3; }

h1, .headline-primary, .headline-primary--grouped {
  color: #525559;
  font-weight: 300;
  font-size: 2.625em;
  line-height: 1.09524;
  margin-top: 0; }

h2, .headline-secondary, .headline-secondary--grouped {
  color: #999da1;
  letter-spacing: 1px;
  font-weight: 300;
  font-size: 1.5em;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; }

.form__btn, [class^="btn--"] {
  padding: 10px 20px;
  border: 0;
  border-radius: 0.4em;
  color: #fff;
  text-transform: uppercase;
  font-size: 0.875em;
  font-weight: 400;
  transition: opacity 0.3s;
  display: block; }
  .form__btn:hover, [class^="btn--"]:hover {
    opacity: .75; }
  .form__btn:active, [class^="btn--"]:active {
    opacity: initial; }

.menu__link, .menu__link--end {
  display: block;
  padding-top: 1em;
  padding-bottom: 1em;
  color: #fff;
  text-align: center;
  text-shadow: 0 1px rgba(11, 11, 11, 0.2);
  font-size: 1.125em; }

.icn--nav-toggle, .icn--close {
  line-height: 0;
  cursor: pointer; }

.img--wrap {
  border: 1px solid #d6d7d9;
  padding: 0.75em; }
.img--avatar {
  display: block;
  margin-left: auto;
  margin-right: auto;
  border-radius: 50%; }
  @media (min-width: 769px) {
    .img--avatar {
      margin-top: 1.5em; } }
@media (min-width: 769px) {
  .img--hero {
    margin-bottom: 2.625em; } }

.headline-primary {
  margin-bottom: 1.66667em; }
  .headline-primary--grouped {
    margin-bottom: 0; }
.headline-secondary {
  margin-bottom: 0.91667em; }
  .headline-secondary--grouped {
    margin-top: 0.41667em;
    margin-bottom: 2.25em; }

.form__label {
  display: block;
  margin-bottom: 0.625em; }
.form__input {
  font-size: 1.125em;
  margin-bottom: 1.11111em;
  border-bottom: 6px solid #d6d7d9;
  border-radius: 0.4em;
  background: #ebecec;
  color: black;
  font-weight: 300; }
  .form__input:focus {
    border-color: #52bab3; }
.form__btn {
  background: #52bab3; }

.btn--default {
  background-color: #52bab3; }
.btn--success {
  background-color: #5ece7f; }
.btn--error {
  background-color: #e67478; }
.btn--warning {
  background-color: #ff784f; }
.btn--info {
  background-color: #9279c3; }

[class^="btn--"] {
  margin-bottom: 1.42857em; }
  @media (min-width: 1px) and (max-width: 768px) {
    [class^="btn--"] {
      width: 100%; } }
  @media (min-width: 769px) {
    [class^="btn--"] {
      width: auto;
      display: inline-block; }
      [class^="btn--"] + [class^="btn--"] {
        margin-left: 20px; } }

.navbar {
  position: relative; }
  @media (min-width: 769px) {
    .navbar {
      margin-top: 3.375em;
      margin-bottom: 0; } }

.nav {
  margin-top: 1.25em;
  margin-bottom: 1.875em; }
  .nav__item a {
    color: #797e83; }

.offcanvas {
  position: relative;
  padding: 0.625em;
  letter-spacing: 1px;
  background: #39add1;
  background: linear-gradient(45deg, rgba(94, 206, 127, 0.8) 0%, #39add1 100%); }

.menu {
  margin-top: 1.25em; }
  .menu__link {
    border-bottom: solid 1px rgba(255, 255, 255, 0.3); }

.progbar {
  height: 4px;
  border-radius: 2px;
  background: #d6d7d9;
  position: relative;
  margin-bottom: 2.875em; }
  .progbar__status--default {
    background-color: #52bab3; }
    .progbar__status--default:after {
      background-color: #6fc6c0; }
  .progbar__status--success {
    background-color: #5ece7f; }
    .progbar__status--success:after {
      background-color: #7dd898; }
  .progbar__status--error {
    background-color: #e67478; }
    .progbar__status--error:after {
      background-color: #ec979a; }
  .progbar__status--warning {
    background-color: #ff784f; }
    .progbar__status--warning:after {
      background-color: #ff9778; }
  .progbar__status--info {
    background-color: #9279c3; }
    .progbar__status--info:after {
      background-color: #a995d0; }

[class^="progbar__"] {
  display: block;
  width: 50%;
  height: 100%;
  border-radius: inherit;
  position: relative; }
  [class^="progbar__"]:after {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    right: -10px;
    top: -8px; }

.site-logo {
  background-image: url("../img/logo.svg");
  background-repeat: no-repeat;
  width: 115px;
  height: 45px;
  display: inline-block; }

.icn--nav-toggle {
  width: 25px;
  height: 17px;
  border-top: solid 3px #797e83;
  border-bottom: solid 3px #797e83;
  position: relative; }
  .icn--nav-toggle:before {
    width: 25px;
    height: 3px;
    background: #999da1;
    top: 4px; }
.icn--close {
  background-image: url("../img/icn-close.svg");
  background-repeat: no-repeat;
  width: 20px;
  height: 20px;
  display: block;
  position: absolute;
  right: 4%;
  top: 4%; }

@media (min-width: 1px) and (max-width: 768px) {
  .is-displayed-mobile {
    display: block; }
    .is-hidden-mobile {
      display: none; } }
@media (min-width: 769px) {
  .is-displayed-mobile {
    display: none; } }

@media (min-width: 1px) and (max-width: 768px) {
  .is-collapsed-mobile {
    visibility: collapse;
    padding: 0;
    height: 0;
    margin: 0;
    line-height: 0; } }

.theme__poly .grid__col--12 {
  background-color: #DEF4E5; }

.theme__poly .grid__col--8 {
  background-color: #DCE0F2; }

.theme__poly .grid__col--7 {
  background-color: #DCF0EF; }

.theme__poly .grid__col--6 {
  background-color: #FFE3DB; }

.theme__poly .grid__col--4 {
  background-color: #F8EDD0; }

.theme__poly .grid__col--5 {
  background-color: #EAEBEC; }

.theme__poly .grid__col--2 {
  background-color: #C5E2CE; }

.theme__poly .grid__col--3 {
  background-color: #D6EEF5; }
!

JS 

              
                function Quiz(questions) {
    this.score = 0; 
    this.questions = questions;
    this.currentQuestionIndex = 0;
}

Quiz.prototype.guess = function(points) { //using points instead of answer
    //this.currentQuestionIndex++;
    this.score += points; //update the scores
    console.log(this.score);
    this.currentQuestionIndex++;
};

Quiz.prototype.getCurrentQuestion = function() {
    return this.questions[this.currentQuestionIndex];
};

Quiz.prototype.hasEnded = function() {
    return this.currentQuestionIndex >= this.questions.length;
};

//questions
function Question(text, choices, points) {
    this.text = text;
    this.choices = choices;
    this.points = points;
}

//display the quiz
var QuizUI = {
    displayNext: function () {
        if (quiz.hasEnded()) {
            this.displayScore();
        } else {
            this.displayQuestion();
            this.displayChoices();
            this.displayProgress();
        }
    },
    displayQuestion: function() {
        this.populateIdWithHTML("question", quiz.getCurrentQuestion().text);
    },
    displayChoices: function() {
        var choices = quiz.getCurrentQuestion().choices;
        var points = quiz.getCurrentQuestion().points; //get the points for this question

        for(var i = 0; i < choices.length; i++) {
            this.populateIdWithHTML("choice" + i, choices[i]);
            this.guessHandler("guess" + i, points[i]); // pass the points  to the handler
        }
    },
    displayScore: function() {
        var gameOverHTML = "";  
        var resetbtn = '<button id="reset_btn">Neuer Test</button>';//create reset button to play the quiz again
        var gRed = `<h1>Answer 1</h1> <p>${resetbtn}</p>`;
        var gBlue = `<h1>Answer 2</h1> <p>${resetbtn}</p>`;
        //event Listener for the Button it does not work.
        var resetButton = document.getElementById('reset_btn');
        resetButton.addEventListener('click', function(e) {
                location.reload();
        }, false);
        
        //if statements to display after quiz
         if(quiz.score >= 2 && quiz.score <= 4){
            gameOverHTML = gRed;
            //console.log(quiz.score);
        }else if(quiz.score >= 4 && quiz.score <= 8){
            gameOverHTML = gBlue;
        }
        this.populateIdWithHTML("quiz", gameOverHTML);
    },
    
    populateIdWithHTML: function(id, text) {
        var element = document.getElementById(id);
        element.innerHTML = text;
    },
    //guessHandler: function(id, guess) {
    guessHandler: function(id, points) { //use points instead of answer
        var button = document.getElementById(id);
        button.onclick = function() {
            //quiz.guess(guess);
            quiz.guess(points); //pass along points instead of answer
            QuizUI.displayNext();

        }
    },
    
    displayProgress: function(e) {
        var currentQuestionNumber = quiz.currentQuestionIndex;
        var progressHTML = '';
        //console.log(quiz.currentQuestionIndex);
        for (i = 0; i < quiz.questions.length; i++) {
            progressHTML += '<li class="pagination' + 
            (quiz.currentQuestionIndex == i ? " active" : " ") + 
             '" id="' + [i] + '"></li>';   
        }
        
        this.populateIdWithHTML("progress", progressHTML);
    }
};
//Create Questions
var questions = [
    new Question('question 1?', ['answer a', 'answer b', 'answer c', 'answer d'], [1, 2, 3, 4]),
    new Question('question 2?', ['answer a', 'answer b', 'answer c', 'answer d'], [1, 2, 3, 4])
];

//Create Quiz
var quiz = new Quiz(questions);

//Display Quiz
QuizUI.displayNext();
!
999px

Console