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HTML

              
                <!-- nest in a wrapping container 
  one div for each question and connected answer(s)
  a header in which to show the result of the small quiz
-->
<div class="container">

  <!-- each question in this "faq"  comprises a details element
    in said details element:
      a summary element provides the actual question
      a div contains then four possible answers

    in the JS script, upon choosing an answer, the correct answer is applied a class which visually remarks its rightful nature
  -->

  <div class="question">
    <details>
      <summary>
        <h2>Which framework supports this project?</h2>
      </summary>
      <div class="answers">
        <div class="answer">
          Bulma
        </div>
        <div class="answer">
          Bootstrap
        </div>
        <div class="answer">
          Bibbity Bobbity Boo
        </div>
        <div class="answer correct-answer">
          None of the above
        </div>
      </div>
    </details>
  </div><!-- close question div -->

  <div class="question">
    <details>
      <summary>
        <h2>Which CSS property creates this background?</h2>
      </summary>
      <div class="answers">
        <div class="answer">
          mask
        </div>
        <div class="answer correct-answer">
          clip-path
        </div>
        <div class="answer">
          border
        </div>
        <div class="answer">
          background
        </div>
      </div>
    </details>
  </div><!-- close question div -->

  <div class="question">
    <details>
      <summary>
        <h2>Which color is <span class="highlight">not</span> used in this page?</h2>
      </summary>
      <div class="answers">
        <div class="answer">
          #422980
        </div>
        <div class="answer">
          #EB761F
        </div>
        <div class="answer correct-answer">
          #252525
        </div>
        <div class="answer">
          #00D539
        </div>
      </div>
    </details>
  </div><!-- close question div -->

  <div class="question">
    <details>
      <summary>
        <h2>Which font is used in this page?</h2>
      </summary>
      <div class="answers">
        <div class="answer correct-answer">
          Source Sans Pro
        </div>
        <div class="answer">
          Open Sans
        </div>
        <div class="answer">
          Lato
        </div>
        <div class="answer">
          Montserrat
        </div>
      </div>
    </details>
  </div><!-- close question div -->

  <div class="question">
    <details>
      <summary>
        <h2>Which layout system arranges the elements of this page?</h2>
      </summary>
      <div class="answers">
        <div class="answer">
          Grid
        </div>
        <div class="answer">
          Flexbox
        </div>
        <div class="answer">
          Neither
        </div>
        <div class="answer correct-answer">
          Both
        </div>
      </div>
    </details>
  </div><!-- close question div -->

  <h1 class="result"></h1>

</div><!-- close the wrapping .container div -->
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Source+Sans+Pro');

/* define variables for the font and colors used in the project */
:root {
  --font-main: 'Source Sans Pro', sans-serif;
  --color-bg: #422980;
  --color-txt: #EBEEF3;
  --color-accent: #EB761F;
  --color-accent-right-answer: #00D539;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  min-height: 100vh;
  width: 100%;
  font-family: var(--font-main);
  color: var(--color-txt);
  background: linear-gradient(to right, #5e3ead, var(--color-txt), #5e3ead);
}

.container {
  /* display the questions and the header in a single column layout */
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.container .question details summary {
  background: var(--color-bg);
  margin: 1rem;
  max-width: 550px;
  text-align: center;
  /* create the peculiar background by creating a polygon with clip-path */
  clip-path: polygon(10% 0, 90% 0, 100% 50%, 90% 100%, 10% 100%, 0 50%);
}
.container .question details summary h2 {
  padding: 1rem 3rem;
  font-size: 2rem;
}
.container .question details summary h2 .highlight {
  /* style highlighted words */
  text-transform: uppercase;
  text-decoration: underline;
}

.container .question details .answers {
  /* display the four answers in a 2x2 grid which occupies the entirety of the width and height allocated by the details element */
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  font-size: 1.4rem;
}

.container .question details .answer {
  background: var(--color-bg);
  clip-path: polygon(5% 0, 95% 0, 100% 50%, 95% 100%, 5% 100%, 0 50%);
  margin: 1rem;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  text-align: center;
}
.container .question details .answer:hover {
  background: var(--color-accent);  
}

/* remove the default triangle for every summmary element */
summary::-webkit-details-marker {
  display: none;
}

.container .question details .reveal-chosen-answer {
  /* change the background color for the answer which is given, but which is wrong (this class is applied in the JS script to the wrong answer) */
  background: var(--color-accent);
}

.container .question details .reveal-correct-answer {
  /* include an animation for the answer which is revealed to be correct (this class is applied in the JS script to the correct answer) */
  animation: correctAnswer 1s step-start forwards 4;
}
@keyframes correctAnswer {
  /* change background color from and to the chosen accent color
    as per step-start, the animation moves discretely from one value to another
    as per forwards, the animation retains the property described in the final keyframe
  */
  0%, 100% {
    background: var(--color-accent-right-answer);
  }
  50% {
    background: var(--color-bg);
  }
}

h1.result {
  background: var(--color-bg);
  clip-path: polygon(10% 0, 90% 0, 100% 50%, 90% 100%, 10% 100%, 0 50%);
  padding: 0.5rem 2rem;  
}

/* for small screen devices, include each of the four answers in a single row and reduce the size of the questions' header */
@media screen and (max-width:700px) {
  .container .question details summary h2 {
    font-size: 1.5rem;
  }
  .container .question details .answers {
    grid-template-columns: 1fr;
  }
}


              
            
!

JS

              
                // target all answers in the HTML document
const answers = document.querySelectorAll(".container .question .answers .answer");

// target the h1 header in which to include the results of the quiz
const headerResult = document.querySelector(".result");

// listen for a click event on each answer, at which point reveal the correct answer for the connected question
answers.forEach(answer => answer.addEventListener("click", revealAnswer));

// initialize two variables to keep track of 1) the number of answers given and 1) the number of correct answers
let counterAnswers = 0;
let counterCorrectAnswers = 0;

// declare a function to reveal the correct answer, count the number of correct answers and show a result once all questions are answered
function revealAnswer(e) {
    // consider the parent element of the clicked answer
    let parentElement = e.target.parentElement;
    // target, inside of the parent element, the correct answer
    let correctAnswer = parentElement.querySelector(".correct-answer");

    // if the correct element is not already revealed
    if(!correctAnswer.classList.contains("reveal-correct-answer")) {
        // add a class to the correct answer, visually informing the user of the right choice
        correctAnswer.classList.add("reveal-correct-answer");
        // if the chosen answer was the correct one, increment the correct answer's counter
        if(e.target == correctAnswer) {
            counterCorrectAnswers++;
        } 
        // else change the background color of the chosen answer
        else {
            e.target.classList.add("reveal-chosen-answer");
        }
    }

    // consider all answers of the chosen question and remove the event listener from all them, to avoid firing the function twice on the same question
    let answers = parentElement.querySelectorAll(".answer");
    answers.forEach(answer => {
        answer.removeEventListener("click", revealAnswer);
        answer.style.cursor = "default";
    });

    // increment the counter keeping track of the number of questions answered
    counterAnswers++;

    // once all questions are answered, call a function to display the result
    if(counterAnswers == 5) {
        displayResult(counterCorrectAnswers);
    }

}

// declare a function which takes as argument the number of correct answers and displays a message tailored to said number
function displayResult(number) {
    // initialize a string which includes a comment, tailored to how many correct answers were given
    let comment = '';
        switch(number) {
            case 5:
                comment = "😎";
                break;
            case 4:
            case 3:
                comment = "😉";
                break;
            case 2:
            case 1:
                comment = "😏";
                break;
                break;
            case 0:
                comment = "😶";
                break;
        }
        // include in the main header the result and the comment
        headerResult.textContent = `${number} Correct Answers ${comment}`;
}
              
            
!
999px

Console