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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Awesome Quiz App | Dedication to Computer Science</title>
    <link rel="stylesheet" href="style.css">
    <!-- FontAweome CDN Link for Icons -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"/>
</head>
<body>
    <!-- start Quiz button -->
    <div class="start_btn"><button>Start Quiz</button></div>

    <!-- Info Box -->
    <div class="info_box">
        <div class="info-title"><span>Some Rules of this Quiz</span></div>
        <div class="info-list">
           <div class="info">1. There are 10 questions</div>
            <div class="info">2. You will have only <span>15 seconds</span> per each question.</div>
            <div class="info">3. Once you select your answer, it can't be undone.</div>
            <div class="info">4. You can't select any option once time goes off.</div>
            <div class="info">5. You can't exit from the Quiz while you're playing.</div>
            <div class="info">6. You'll get points on the basis of your correct answers.</div>
        </div>
        <div class="buttons">
            <button class="quit">Exit Quiz</button>
            <button class="restart">Continue</button>
        </div>
    </div>

    <!-- Quiz Box -->
    <div class="quiz_box">
        <header>
            <div class="title">Awesome Quiz Application</div>
            <div class="timer">
                <div class="time_left_txt">Time Left</div>
                <div class="timer_sec">15</div>
            </div>
            <div class="time_line"></div>
        </header>
        <section>
            <div class="que_text">
                <!-- Here I've inserted question from JavaScript -->
            </div>
            <div class="option_list">
                <!-- Here I've inserted options from JavaScript -->
            </div>
        </section>

        <!-- footer of Quiz Box -->
        <footer>
            <div class="total_que">
                <!-- Here I've inserted Question Count Number from JavaScript -->
            </div>
            <button class="next_btn">Next Que</button>
        </footer>
    </div>

    <!-- Result Box -->
    <div class="result_box">
        <div class="icon">
            <i class="fas fa-crown"></i>
        </div>
        <div class="complete_text">You've completed the Quiz!</div>
        <div class="score_text">
            <!-- Here I've inserted Score Result from JavaScript -->
        </div>
        <div class="buttons">
            <button class="restart">Replay Quiz</button>
            <button class="quit">Quit Quiz</button>
        </div>
    </div>

    <!-- Inside this JavaScript file I've inserted Questions and Options only -->
    <script src="js/questions.js"></script>

    <!-- Inside this JavaScript file I've coded all Quiz Codes -->
    <script src="js/script.js"></script>

</body>
</html>
</html>
              
            
!

CSS

              
                /* importing google fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:[email protected];300;400;500;600;700&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body{
    background-image: url("https://static1.makeuseofimages.com/wordpress/wp-content/uploads/2021/06/17.-Sea-Lord.png?q=50&fit=crop&w=750&dpr=1.5");
  background-repeat: no-repeat;
  background-size: 150%;
}

::selection{
    color: #fff;
    background: #007bff;
}

.start_btn,
.info_box,
.quiz_box,
.result_box{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 
                0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.info_box.activeInfo,
.quiz_box.activeQuiz,
.result_box.activeResult{
    opacity: 1;
    z-index: 5;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.start_btn button{
    font-size: 25px;
    font-weight: 500;
    color: #007bff;
    padding: 15px 30px;
    outline: none;
    border: none;
    border-radius: 5px;
    background: #fff;
    cursor: pointer;
}

.info_box{
    width: 540px;
    background: #fff;
    border-radius: 5px;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.info_box .info-title{
    height: 60px;
    width: 100%;
    border-bottom: 1px solid lightgrey;
    display: flex;
    align-items: center;
    padding: 0 30px;
    border-radius: 5px 5px 0 0;
    font-size: 20px;
    font-weight: 600;
}

.info_box .info-list{
    padding: 15px 30px;
}

.info_box .info-list .info{
    margin: 5px 0;
    font-size: 17px;
}

.info_box .info-list .info span{
    font-weight: 600;
    color: #007bff;
}
.info_box .buttons{
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 30px;
    border-top: 1px solid lightgrey;
}

.info_box .buttons button{
    margin: 0 5px;
    height: 40px;
    width: 100px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 5px;
    border: 1px solid #007bff;
    transition: all 0.3s ease;
}

.quiz_box{
    width: 550px;
    background: #fff;
    border-radius: 5px;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.quiz_box header{
    position: relative;
    z-index: 2;
    height: 70px;
    padding: 0 30px;
    background: #fff;
    border-radius: 5px 5px 0 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0px 3px 5px 1px rgba(0,0,0,0.1);
}

.quiz_box header .title{
    font-size: 20px;
    font-weight: 600;
}

.quiz_box header .timer{
    color: #004085;
    background: #cce5ff;
    border: 1px solid #b8daff;
    height: 45px;
    padding: 0 8px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 145px;
}

.quiz_box header .timer .time_left_txt{
    font-weight: 400;
    font-size: 17px;
    user-select: none;
}

.quiz_box header .timer .timer_sec{
    font-size: 18px;
    font-weight: 500;
    height: 30px;
    width: 45px;
    color: #fff;
    border-radius: 5px;
    line-height: 30px;
    text-align: center;
    background: #343a40;
    border: 1px solid #343a40;
    user-select: none;
}

.quiz_box header .time_line{
    position: absolute;
    bottom: 0px;
    left: 0px;
    height: 3px;
    background: #007bff;
}

section{
    padding: 25px 30px 20px 30px;
    background: #fff;
}

section .que_text{
    font-size: 25px;
    font-weight: 600;
}

section .option_list{
    padding: 20px 0px;
    display: block;   
}

section .option_list .option{
    background: aliceblue;
    border: 1px solid #84c5fe;
    border-radius: 5px;
    padding: 8px 15px;
    font-size: 17px;
    margin-bottom: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

section .option_list .option:last-child{
    margin-bottom: 0px;
}

section .option_list .option:hover{
    color: #004085;
    background: #cce5ff;
    border: 1px solid #b8daff;
}

section .option_list .option.correct{
    color: #155724;
    background: #d4edda;
    border: 1px solid #c3e6cb;
}

section .option_list .option.incorrect{
    color: #721c24;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
}

section .option_list .option.disabled{
    pointer-events: none;
}

section .option_list .option .icon{
    height: 26px;
    width: 26px;
    border: 2px solid transparent;
    border-radius: 50%;
    text-align: center;
    font-size: 13px;
    pointer-events: none;
    transition: all 0.3s ease;
    line-height: 24px;
}
.option_list .option .icon.tick{
    color: #23903c;
    border-color: #23903c;
    background: #d4edda;
}

.option_list .option .icon.cross{
    color: #a42834;
    background: #f8d7da;
    border-color: #a42834;
}

footer{
    height: 60px;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid lightgrey;
}

footer .total_que span{
    display: flex;
    user-select: none;
}

footer .total_que span p{
    font-weight: 500;
    padding: 0 5px;
}

footer .total_que span p:first-child{
    padding-left: 0px;
}

footer button{
    height: 40px;
    padding: 0 13px;
    font-size: 18px;
    font-weight: 400;
    cursor: pointer;
    border: none;
    outline: none;
    color: #fff;
    border-radius: 5px;
    background: #007bff;
    border: 1px solid #007bff;
    line-height: 10px;
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
    transition: all 0.3s ease;
}

footer button:hover{
    background: #0263ca;
}

footer button.show{
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}

.result_box{
    background: #fff;
    border-radius: 5px;
    display: flex;
    padding: 25px 30px;
    width: 450px;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    transform: translate(-50%, -50%) scale(0.9);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

.result_box .icon{
    font-size: 100px;
    color: #007bff;
    margin-bottom: 10px;
}

.result_box .complete_text{
    font-size: 20px;
    font-weight: 500;
}

.result_box .score_text span{
    display: flex;
    margin: 10px 0;
    font-size: 18px;
    font-weight: 500;
}

.result_box .score_text span p{
    padding: 0 4px;
    font-weight: 600;
}

.result_box .buttons{
    display: flex;
    margin: 20px 0;
}

.result_box .buttons button{
    margin: 0 10px;
    height: 45px;
    padding: 0 20px;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    outline: none;
    border-radius: 5px;
    border: 1px solid #007bff;
    transition: all 0.3s ease;
}

.buttons button.restart{
    color: #fff;
    background: #007bff;
}

.buttons button.restart:hover{
    background: #0263ca;
}

.buttons button.quit{
    color: #007bff;
    background: #fff;
}

.buttons button.quit:hover{
    color: #fff;
    background: #007bff;
}
              
            
!

JS

              
                // creating an array and passing the number, questions, options, and answers
let questions = [
  {
    numb: 1,
    question: "What does HTML stand for?",
    answer: "Hyper Text Markup Language",
    options: [
      "Hyper Text Preprocessor",
      "Hyper Text Markup Language",
      "Hyper Text Multiple Language",
      "Hyper Tool Multi Language"
    ]
  },
  {
    numb: 2,
    question: "What does CSS stand for?",
    answer: "Cascading Style Sheet",
    options: [
      "Common Style Sheet",
      "Colorful Style Sheet",
      "Computer Style Sheet",
      "Cascading Style Sheet"
    ]
  },
  {
    numb: 3,
    question: "What does PHP stand for?",
    answer: "Hypertext Preprocessor",
    options: [
      "Hypertext Preprocessor",
      "Hypertext Programming",
      "Hypertext Preprogramming",
      "Hometext Preprocessor"
    ]
  },
  {
    numb: 4,
    question: "What does SQL stand for?",
    answer: "Structured Query Language",
    options: [
      "Stylish Question Language",
      "Stylesheet Query Language",
      "Statement Question Language",
      "Structured Query Language"
    ]
  },
  {
    numb: 5,
    question: "What does XML stand for?",
    answer: "eXtensible Markup Language",
    options: [
      "eXtensible Markup Language",
      "eXecutable Multiple Language",
      "eXTra Multi-Program Language",
      "eXamine Multiple Language"
    ]
  },
  {
    numb: 6,
    question: "When was HTML5 created?",
    answer: "1993",
    options: ["1157", "1985", "1993", "1991"]
  },
  {
    numb: 7,
    question: "When was CSS proposed?",
    answer: "1994",
    options: ["1994", "1986", "1997", "2003"]
  },
  {
    numb: 8,
    question: "When was CodePen.io created?",
    answer: "2012",
    options: ["2013", "2012", "2009", "2010"]
  },
  {
    numb: 9,
    question: "What are the three coding languages featured in CodePen?",
    answer: "HTML,CSS and JavaScript",
    options: [
      "HTML,C++ and JSON",
      "Javascript,CSS and SQL",
      "HTML,CSS and JavaScript",
      "C++,C# and C"
    ]
  },
  {
    numb: 10,
    question: "When was JavaScript created?",
    answer: "1996",
    options: ["2005", "1991", "1996", "2001"]
  }
  // you can uncomment the below codes and make duplicate as more as you want to add question
  // but remember you need to give the numb value serialize like 1,2,3,5,6,7,8,9.....

  //   {
  //   numb: 6,
  //   question: "Your Question is Here",
  //   answer: "Correct answer of the question is here",
  //   options: [
  //     "Option 1",
  //     "option 2",
  //     "option 3",
  //     "option 4"
  //   ]
  // },
];
//selecting all required elements
const start_btn = document.querySelector(".start_btn button");
const info_box = document.querySelector(".info_box");
const exit_btn = info_box.querySelector(".buttons .quit");
const continue_btn = info_box.querySelector(".buttons .restart");
const quiz_box = document.querySelector(".quiz_box");
const result_box = document.querySelector(".result_box");
const option_list = document.querySelector(".option_list");
const time_line = document.querySelector("header .time_line");
const timeText = document.querySelector(".timer .time_left_txt");
const timeCount = document.querySelector(".timer .timer_sec");

// if startQuiz button clicked
start_btn.onclick = () => {
  info_box.classList.add("activeInfo"); //show info box
};

// if exitQuiz button clicked
exit_btn.onclick = () => {
  info_box.classList.remove("activeInfo"); //hide info box
};

// if continueQuiz button clicked
continue_btn.onclick = () => {
  info_box.classList.remove("activeInfo"); //hide info box
  quiz_box.classList.add("activeQuiz"); //show quiz box
  showQuetions(0); //calling showQestions function
  queCounter(1); //passing 1 parameter to queCounter
  startTimer(15); //calling startTimer function
  startTimerLine(0); //calling startTimerLine function
};

let timeValue = 15;
let que_count = 0;
let que_numb = 1;
let userScore = 0;
let counter;
let counterLine;
let widthValue = 0;

const restart_quiz = result_box.querySelector(".buttons .restart");
const quit_quiz = result_box.querySelector(".buttons .quit");

// if restartQuiz button clicked
restart_quiz.onclick = () => {
  quiz_box.classList.add("activeQuiz"); //show quiz box
  result_box.classList.remove("activeResult"); //hide result box
  timeValue = 15;
  que_count = 0;
  que_numb = 1;
  userScore = 0;
  widthValue = 0;
  showQuetions(que_count); //calling showQestions function
  queCounter(que_numb); //passing que_numb value to queCounter
  clearInterval(counter); //clear counter
  clearInterval(counterLine); //clear counterLine
  startTimer(timeValue); //calling startTimer function
  startTimerLine(widthValue); //calling startTimerLine function
  timeText.textContent = "Time Left"; //change the text of timeText to Time Left
  next_btn.classList.remove("show"); //hide the next button
};

// if quitQuiz button clicked
quit_quiz.onclick = () => {
  window.location.reload(); //reload the current window
};

const next_btn = document.querySelector("footer .next_btn");
const bottom_ques_counter = document.querySelector("footer .total_que");

// if Next Que button clicked
next_btn.onclick = () => {
  if (que_count < questions.length - 1) {
    //if question count is less than total question length
    que_count++; //increment the que_count value
    que_numb++; //increment the que_numb value
    showQuetions(que_count); //calling showQestions function
    queCounter(que_numb); //passing que_numb value to queCounter
    clearInterval(counter); //clear counter
    clearInterval(counterLine); //clear counterLine
    startTimer(timeValue); //calling startTimer function
    startTimerLine(widthValue); //calling startTimerLine function
    timeText.textContent = "Time Left"; //change the timeText to Time Left
    next_btn.classList.remove("show"); //hide the next button
  } else {
    clearInterval(counter); //clear counter
    clearInterval(counterLine); //clear counterLine
    showResult(); //calling showResult function
  }
};

// getting questions and options from array
function showQuetions(index) {
  const que_text = document.querySelector(".que_text");

  //creating a new span and div tag for question and option and passing the value using array index
  let que_tag =
    "<span>" +
    questions[index].numb +
    ". " +
    questions[index].question +
    "</span>";
  let option_tag =
    '<div class="option"><span>' +
    questions[index].options[0] +
    "</span></div>" +
    '<div class="option"><span>' +
    questions[index].options[1] +
    "</span></div>" +
    '<div class="option"><span>' +
    questions[index].options[2] +
    "</span></div>" +
    '<div class="option"><span>' +
    questions[index].options[3] +
    "</span></div>";
  que_text.innerHTML = que_tag; //adding new span tag inside que_tag
  option_list.innerHTML = option_tag; //adding new div tag inside option_tag

  const option = option_list.querySelectorAll(".option");

  // set onclick attribute to all available options
  for (i = 0; i < option.length; i++) {
    option[i].setAttribute("onclick", "optionSelected(this)");
  }
}
// creating the new div tags which for icons
let tickIconTag = '<div class="icon tick"><i class="fas fa-check"></i></div>';
let crossIconTag = '<div class="icon cross"><i class="fas fa-times"></i></div>';

//if user clicked on option
function optionSelected(answer) {
  clearInterval(counter); //clear counter
  clearInterval(counterLine); //clear counterLine
  let userAns = answer.textContent; //getting user selected option
  let correcAns = questions[que_count].answer; //getting correct answer from array
  const allOptions = option_list.children.length; //getting all option items

  if (userAns == correcAns) {
    //if user selected option is equal to array's correct answer
    userScore += 1; //upgrading score value with 1
    answer.classList.add("correct"); //adding green color to correct selected option
    answer.insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to correct selected option
    console.log("Correct Answer");
    console.log("Your correct answers = " + userScore);
  } else {
    answer.classList.add("incorrect"); //adding red color to correct selected option
    answer.insertAdjacentHTML("beforeend", crossIconTag); //adding cross icon to correct selected option
    console.log("Wrong Answer");

    for (i = 0; i < allOptions; i++) {
      if (option_list.children[i].textContent == correcAns) {
        //if there is an option which is matched to an array answer
        option_list.children[i].setAttribute("class", "option correct"); //adding green color to matched option
        option_list.children[i].insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to matched option
        console.log("Auto selected correct answer.");
      }
    }
  }
  for (i = 0; i < allOptions; i++) {
    option_list.children[i].classList.add("disabled"); //once user select an option then disabled all options
  }
  next_btn.classList.add("show"); //show the next button if user selected any option
}

function showResult() {
  info_box.classList.remove("activeInfo"); //hide info box
  quiz_box.classList.remove("activeQuiz"); //hide quiz box
  result_box.classList.add("activeResult"); //show result box
  const scoreText = result_box.querySelector(".score_text");
  if (userScore > 3) {
    // if user scored more than 3
    //creating a new span tag and passing the user score number and total question number
    let scoreTag =
      "<span>and congrats! , You got <p>" +
      userScore +
      "</p> out of <p>" +
      questions.length +
      "</p></span>";
    scoreText.innerHTML = scoreTag; //adding new span tag inside score_Text
  } else if (userScore > 1) {
    // if user scored more than 1
    let scoreTag =
      "<span>and nice , You got <p>" +
      userScore +
      "</p> out of <p>" +
      questions.length +
      "</p></span>";
    scoreText.innerHTML = scoreTag;
  } else {
    // if user scored less than 1
    let scoreTag =
      "<span>and sorry , You got only <p>" +
      userScore +
      "</p> out of <p>" +
      questions.length +
      "</p></span>";
    scoreText.innerHTML = scoreTag;
  }
}

function startTimer(time) {
  counter = setInterval(timer, 1000);
  function timer() {
    timeCount.textContent = time; //changing the value of timeCount with time value
    time--; //decrement the time value
    if (time < 9) {
      //if timer is less than 9
      let addZero = timeCount.textContent;
      timeCount.textContent = "0" + addZero; //add a 0 before time value
    }
    if (time < 0) {
      //if timer is less than 0
      clearInterval(counter); //clear counter
      timeText.textContent = "Time Off"; //change the time text to time off
      const allOptions = option_list.children.length; //getting all option items
      let correcAns = questions[que_count].answer; //getting correct answer from array
      for (i = 0; i < allOptions; i++) {
        if (option_list.children[i].textContent == correcAns) {
          //if there is an option which is matched to an array answer
          option_list.children[i].setAttribute("class", "option correct"); //adding green color to matched option
          option_list.children[i].insertAdjacentHTML("beforeend", tickIconTag); //adding tick icon to matched option
          console.log("Time Off: Auto selected correct answer.");
        }
      }
      for (i = 0; i < allOptions; i++) {
        option_list.children[i].classList.add("disabled"); //once user select an option then disabled all options
      }
      next_btn.classList.add("show"); //show the next button if user selected any option
    }
  }
}

function startTimerLine(time) {
  counterLine = setInterval(timer, 29);
  function timer() {
    time += 1; //upgrading time value with 1
    time_line.style.width = time + "px"; //increasing width of time_line with px by time value
    if (time > 549) {
      //if time value is greater than 549
      clearInterval(counterLine); //clear counterLine
    }
  }
}

function queCounter(index) {
  //creating a new span tag and passing the question number and total question
  let totalQueCounTag =
    "<span><p>" +
    index +
    "</p> of <p>" +
    questions.length +
    "</p> Questions</span>";
  bottom_ques_counter.innerHTML = totalQueCounTag; //adding new span tag inside bottom_ques_counter
}

              
            
!
999px

Console