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HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700&display=swap");

$font: "Be Vietnam Pro", sans-serif;
$color: #1f8197;

* {
  box-sizing: border-box;
  font-family: $font;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button {
  font-family: $font;
}

body {
  padding: 0 10vh;
  background-color: #1c1d20;
  background: rgb(149, 233, 227);
  background: linear-gradient(
    62deg,
    rgba(149, 233, 227, 1) 30%,
    rgba(31, 190, 210, 1) 41%,
    rgba(11, 38, 50, 1) 85%
  );
  font-family: $font;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  display: flex;
  &:after {
    content: "";
    background-image: url(https://images.unsplash.com/photo-1623479322729-28b25c16b011?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1740&q=80);
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    z-index: -1;
    height: 100%;
    background-repeat: no-repeat;
    transition: 0.3s;
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
  }

  @media (max-width: 980px), (max-height: 580px) {
    padding: 60px 20px;
  }
}

#app {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.game-started:after {
  transform: translateX(calc(-50% - 100px));
  @media (max-width: 980px), (max-height: 580px) {
    transform: scale(1.2);
  }
}

.game {
  position: relative;
  max-width: 600px;
  width: 100%;
  height: 36vh;
  min-height: max-content;
  margin: 32vh auto;
  box-shadow: 0 0 80px rgba(0, 0, 0, 1), 0 0 0 16px rgba(152, 236, 255, 0.1);
  border-radius: 12px;
  overflow: hidden;
  scroll-behavior: smooth;
  display: flex;
  transition: 0.3s;

  @media (max-width: 980px), (max-height: 580px) {
    margin: auto;
    height: 52vh;
    flex-direction: column;
    overflow: auto;
    align-items: flex-start;
  }

  &[data-game-started] {
    max-width: 1200px;
    margin: 15vh auto;
    height: 70vh;

    @media (max-width: 980px), (max-height: 580px) {
      height: auto;
      overflow: auto;
      margin: auto;
      max-height: 100%;
    }

    .intro {
      width: calc(50% - 100px);
      transition: 0.3s;

      @media (max-width: 980px), (max-height: 580px) {
        width: 100%;
        height: auto;
      }

      &-inner {
        padding: 20px;

        @media (max-width: 980px), (max-height: 580px) {
          padding: 40px 20px;
        }
      }
    }
    .game-area {
      flex-shrink: 0;
      width: calc(50% + 100px);
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      transition: 0.3s;
      flex-grow: 1;

      @media (max-width: 980px), (max-height: 580px) {
        width: 100%;
        padding: 20px;
      }
    }
  }
}

.game-area {
  background-color: #fff;
  overflow: auto;
  padding: 40px;

  @media (max-width: 980px), (max-height: 580px) {
    padding: 0;
  }
}

.intro {
  background-size: cover;
  height: 100%;
  width: 100%;
  flex-shrink: 0;
  color: #fff;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  background: linear-gradient(
    251deg,
    #00b8ff52 -53%,
    rgba(255, 255, 255, 0) 65%
  );
  justify-content: center;
  backdrop-filter: blur(30px);

  &-inner {
    text-align: center;
    padding: 30px 60px;
    width: 100%;
  }

  &-title {
    margin: 0;
    font-size: 42px;
    text-shadow: 1px 2px 0 rgba(0, 0, 0, 0.35);
  }

  &-desc {
    opacity: 0.8;
    font-weight: 300;
  }

  &-button {
    background-color: $color;
    border: 0;
    padding: 12px 26px;
    color: #fff;
    border-radius: 4px;
    font-size: 18px;
    transform: translateY(20px);
    cursor: pointer;
    font-weight: 500;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  }
}

.indicator {
  display: flex;
  justify-content: center;
  position: relative;
  max-width: 80%;
  margin: 20px auto 0;

  &-item {
    width: 12px;
    height: 4px;
    border-radius: 6px;
    & + & {
      margin-left: 8px;
    }

    &:last-child:before {
      background: #fff;
      content: "";
      width: 12px;
      height: 4px;
      position: absolute;
      border-radius: 6px;
      left: 0;
      top: 0;
      opacity: 0;
    }

    &:last-child:after {
      content: "COMPLETED";
      position: absolute;
      width: 100%;
      left: 0;
      font-size: 14px;
      letter-spacing: 1px;
      font-weight: 600;
      top: 0;
      opacity: 0;
    }

    &:last-child[style*="255, 255)"]:before {
      animation: indicator 1s both;
    }

    &:last-child[style*="255, 255)"]:after {
      animation: indicator-completed 0.4s 0.8s both;
    }
  }
}

@keyframes indicator {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    height: 6px;
  }
  100% {
    height: 40px;
    top: -2px;
    left: -2px;
    background-color: $color;
  }
  80% {
    background-color: #fff;
  }
  50%,
  100% {
    width: calc(100% + 1px);
  }
}

@keyframes indicator-completed {
  70%,
  100% {
    opacity: 1;
  }

  100% {
    transform: translatey(10px);
  }
}

.question {
  display: flex;
  height: 100%;
  flex-direction: column;
  width: 100%;

  &-inner {
    margin: auto 0;
  }
  &-answers {
    padding: 0;
    list-style: none;
  }

  li,
  &-text {
    opacity: 0;
  }

  &-button {
    background-color: $color;
    border: 0;
    padding: 14px 26px;
    color: #fff;
    border-radius: 4px;
    margin-top: 20px;
    font-size: 16px;
    cursor: pointer;
    font-weight: 500;
  }

  &-text {
    color: #333;
    margin: 20px 0;
  }

  input {
    display: none;
  }

  label {
    display: flex;
    padding: 12px 24px 12px 16px;
    font-size: 15px;
    border-radius: 4px;
    overflow: hidden;
    align-items: center;
    border: 2px solid #dde7eb;
    color: #333;
    cursor: pointer;
    position: relative;

    &:before {
      height: 16px;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%23333' stroke-width='3' fill='none' stroke-linecap='round' stroke-linejoin='round' class='css-i6dzq1'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
      content: "";
      background-size: cover;
      opacity: 0.5;
      transition: 0.3s;
      flex-shrink: 0;
      position: absolute;
      right: -16px;
      top: 50%;
      transform: translatey(-50%);
      width: 16px;
    }
  }

  li + li {
    margin-top: 10px;
  }
  input:checked + label {
    background-color: #dde7eb;

    &:before {
      transform: translatex(-24px) translatey(-50%);
    }
  }
}

.is-true label {
  background-color: rgba($color, 0.2);
  border-color: $color;

  &:before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%231f8197' stroke-width='3' fill='none' stroke-linecap='round' stroke-linejoin='round' class='css-i6dzq1'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    opacity: 1;
    transform: translatex(-24px) translatey(-50%);
  }
}

.correction {
  width: 100%;
}

.correction [data-selected="true"].is-true label {
  border-color: #0ca50c;
  background-color: #a3ebab;

  &:before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%230ca50c' stroke-width='3' fill='none' stroke-linecap='round' stroke-linejoin='round' class='css-i6dzq1'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    opacity: 1;
    transform: translatex(-24px) translatey(-50%);
  }
}

.correction [data-selected="true"]:not(.is-true) label {
  background-color: #ffd5dc;
  border: 2px solid #ff6161;

  &:before {
    opacity: 1;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%23ff6161' stroke-width='3' fill='none' stroke-linecap='round' stroke-linejoin='round' class='css-i6dzq1'%3E%3Cline x1='18' y1='6' x2='6' y2='18'%3E%3C/line%3E%3Cline x1='6' y1='6' x2='18' y2='18'%3E%3C/line%3E%3C/svg%3E");
  }
}

.correction input {
  pointer-events: none;
}

.result {
  transition: 0.3s;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 80%;
  margin: auto;
  height: 0;
  overflow: hidden;

  &-item {
    display: inline-flex;
    flex-direction: row-reverse;
    justify-content: space-between;
    width: 100%;
    padding: 5px 10px;

    & + & {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
  }

  &-count {
    font-size: 32px;
    font-weight: 600;
  }

  &-text {
    font-size: 12px;
    letter-spacing: 2px;
    opacity: 0.8;
    display: flex;
    font-weight: 500;
    align-items: center;
    line-height: 1;

    svg {
      margin-right: 8px;
      position: relative;
      top: -1px;
    }
  }
}

.result-item.is-correct {
  color: #42ff73;
}
.result-item.is-wrong {
  color: #ffa2a2;
}
[data-game-finished] {
  .result {
    opacity: 1;
    margin-top: 40px;
    padding-top: 20px;
    display: flex;
    animation: result 0.6s 0.5s both;

    &-item {
      animation: result-item 0.6s 1.3s both;
      &.is-correct {
        animation-delay: 1s;
      }
      &.is-wrong {
        animation-delay: 1.15s;
      }
    }
  }

  .restart-button {
    display: block;
  }
}

.correction .question + .question {
  margin-top: 30px;
}

@keyframes result {
  0% {
    height: 0;
  }

  100% {
    height: 150px;
  }
}

@keyframes result-item {
  0% {
    opacity: 0;
    transform: translateY(10ox);
  }
}

.restart-button {
  height: 40px;
  border: 1px solid rgba(#fff, 0.4);
  margin: 30px auto 0;
  background-color: transparent;
  color: #fff;
  border-radius: 4px;
  padding: 0 16px;
  font-weight: 500;
  transition: 0.3s;
  cursor: pointer;
  display: none;
  animation: result-item 0.4s 1.45s both;

  &:hover {
    background-color: rgba(#fff, 0.1);
  }
}

              
            
!

JS

              
                import React, {
  useRef,
  useState,
  useEffect
} from "https://cdn.skypack.dev/react";
import { render } from "https://cdn.skypack.dev/react-dom";

import gsap from "https://cdn.skypack.dev/gsap";

const questions = [
  {
    id: 0,
    text: "What does CSS stand for?",
    answers: [
      "Computer Style Sheets",
      "Cascading Style Sheets",
      "Creative Style Sheets",
      "Colorful Style Sheets"
    ],
    correct: 1,
    selection: null
  },
  {
    id: 1,
    text:
      "The property in CSS used to change the background color of an element is?",
    answers: ["bgcolor", "color", "background-color", "All of the above"],
    correct: 2,
    selection: null
  },
  {
    id: 2,
    text: "The property in CSS used to change the text color of an element is?",
    answers: ["bgcolor", "color", "background-color", "All of the above"],
    correct: 1,
    selection: null
  },
  {
    id: 3,
    text: "The CSS property used to control the element's font size is?",
    answers: ["text-style", "font-style", "text-size", "font-size"],
    correct: 3,
    selection: null
  },
  {
    id: 4,
    text: "The HTML attribute used to define the inline styles is?",
    answers: ["style", "inline", "class", "None of the above"],
    correct: 0,
    selection: null
  },
  {
    id: 5,
    text: "Are the negative values allowed in padding property?",
    answers: ["Yes", "No", "It depends on HTML", "None of the above"],
    correct: 1,
    selection: null
  },
  {
    id: 6,
    text:
      "The CSS property used to specify whether the text is written in the horizontal or vertical direction?",
    answers: ["word-break", "text-transform", "writing-mode", "text-direction"],
    correct: 2,
    selection: null
  },
  {
    id: 7,
    text: "Which selector is used to specify a style for one unique element?",
    answers: ["class", "attribute", "text", "id"],
    correct: 3,
    selection: null
  },
  {
    id: 8,
    text:
      "Which of the following is the correct syntax to select the p siblings of a div element?",
    answers: ["p", "div + p", "div p", "div ~ p"],
    correct: 3,
    selection: null
  },
  {
    id: 9,
    text: "How can you add a comment in a CSS file?",
    answers: [
      "/* this is a comment */",
      "// this is a comment",
      "<!-- this is a comment -->",
      "** this is a comment **"
    ],
    correct: 0,
    selection: null
  }
];

function useCounter(initialState) {
  const [value, setValue] = useState(initialState);
  const reset = () => setValue(0);

  const add = () => setValue((value) => (value += 1));

  return { value, add, reset };
}

function Question({
  data,
  buttonText,
  hasButton = true,
  onQuestionButtonClick,
  showAnswer = false,
  markSelection = null
}) {
  const [answer, setAnswer] = useState(null);
  const parseValue = (value) => (value ? parseInt(value.split("-")[1]) : null);
  const questionRef = useRef(null);

  useEffect(() => {
    gsap.fromTo(
      questionRef.current.querySelector(".question-text"),
      {
        x: 40,
        opacity: 0
      },
      {
        x: 0,
        opacity: 1,
        duration: 0.4
      }
    );
    gsap.fromTo(
      questionRef.current.querySelectorAll("li"),
      {
        opacity: 0,
        x: 40
      },
      {
        x: 0,
        opacity: 1,
        duration: 0.4,
        stagger: 0.1
      }
    );
  }, [data]);

  return (
    <div className="question" ref={questionRef}>
      <div className="question-inner">
        <h2 className="question-text">{data.text}</h2>
        <ul className="question-answers">
          {data.answers.map((text, index) => {
            const value = `q${data.id}-${index}`;
            return (
              <li
                className={
                  index === data.correct && showAnswer ? "is-true" : ""
                }
                data-selected={markSelection === index ? true : null}
              >
                <input
                  type="radio"
                  name={`q_${data.id}`}
                  value={value}
                  id={value}
                  onChange={(e) => setAnswer(e.target.value)}
                  checked={
                    !showAnswer ? answer === value : markSelection === index
                  }
                />
                <label className="question-answer" htmlFor={value}>
                  {text}
                </label>
              </li>
            );
          })}
        </ul>
      </div>
      {hasButton && (
        <button
          className="question-button"
          onClick={() => onQuestionButtonClick(parseValue(answer), data)}
        >
          {buttonText}
        </button>
      )}
    </div>
  );
}

function Results({ wrong, correct, empty }) {
  return (
    <div className="result">
      <div className="result-item is-correct">
        <span className="result-count">{correct}</span>
        <span className="result-text">
          <svg
            width="16"
            height="16"
            fill="none"
            stroke="currentColor"
            strokeLinecap="round"
            strokeLinejoin="round"
            strokeWidth="2"
            className="css-i6dzq1"
            viewBox="0 0 24 24"
          >
            <path d="M22 11.08V12a10 10 0 11-5.93-9.14"></path>
            <path d="M22 4L12 14.01 9 11.01"></path>
          </svg>
          CORRECT
        </span>
      </div>
      <div className="result-item is-wrong">
        <span className="result-count">{wrong}</span>
        <span className="result-text">
          <svg
            width="16"
            height="16"
            fill="none"
            stroke="currentColor"
            strokeLinecap="round"
            strokeLinejoin="round"
            strokeWidth="2"
            className="css-i6dzq1"
            viewBox="0 0 24 24"
          >
            <circle cx="12" cy="12" r="10"></circle>
            <path d="M15 9L9 15"></path>
            <path d="M9 9L15 15"></path>
          </svg>
          WRONG
        </span>
      </div>
      <div className="result-item is-empty">
        <span className="result-count">{empty}</span>
        <span className="result-text">
          <svg
            width="16"
            height="16"
            fill="none"
            stroke="currentColor"
            strokeLinecap="round"
            strokeLinejoin="round"
            strokeWidth="2"
            className="css-i6dzq1"
            viewBox="0 0 24 24"
          >
            <circle cx="12" cy="12" r="10"></circle>
            <path d="M8 12L16 12"></path>
          </svg>
          EMPTY
        </span>
      </div>
    </div>
  );
}

function QuestionCorrection({ wrong, correct, empty }) {
  return (
    <div className="correction">
      {questions.map((question) => {
        return (
          <Question
            hasButton={false}
            markSelection={question.selection}
            showAnswer={true}
            data={question}
          />
        );
      })}
    </div>
  );
}

function App() {
  const [gameStarted, setGameStarted] = useState(false);
  const [gameFinished, setGameFinished] = useState(false);
  const [gameSize, setGameSize] = useState({});
  const totalQuestion = questions.length - 1;
  const gameRef = useRef(null);
  const gameOverlayRef = useRef(null);

  const question = useCounter(0);
  const correct = useCounter(0);
  const wrong = useCounter(0);
  const empty = useCounter(0);

  const handleNewQuestionClick = (selectedValue, currQuestion) => {
    if (totalQuestion >= question.value) {
      if (selectedValue === currQuestion.correct) {
        correct.add();
      } else if (
        selectedValue !== null &&
        selectedValue !== currQuestion.correct
      ) {
        wrong.add();
      } else {
        empty.add();
      }
      questions[currQuestion.id].selection = selectedValue;
      question.add();
    }
  };

  const resetSelection = () => {
    questions.forEach((q) => (q.selection = null));
  };

  const handleRestartClick = () => {
    setGameFinished(false);
    setGameStarted(false);
    resetSelection();
    question.reset();
    correct.reset();
    wrong.reset();
    empty.reset();
  };

  const indicatorBg = (index) => {
    if (question.value > index) {
      return "#fff";
    } else if (question.value === index) {
      return "#29b5d5";
    } else {
      return "rgba(255,255,255,.2)";
    }
  };

  useEffect(() => {
    if (gameStarted) {
      document.body.classList.add("game-started");
    } else {
      document.body.classList.remove("game-started");
    }
  }, [gameStarted]);

  useEffect(() => {
    if (question.value > totalQuestion) {
      gameRef.current.scrollTop = 0;
    }
  }, [question.value]);

  return (
    <div
      className="game"
      ref={gameRef}
      data-game-started={gameStarted ? true : null}
      data-game-finished={question.value > totalQuestion ? true : null}
    >
      <div className="intro">
        <div className="intro-inner">
          <h1 className="intro-title">CSS Quiz</h1>
          {!gameStarted && (
            <>
              <p className="intro-desc">
                {`The test contains ${questions.length} questions and there is no time limit.`}
              </p>

              <button
                className="intro-button"
                onClick={() => setGameStarted(true)}
              >
                Start Quiz
              </button>
            </>
          )}
          {gameStarted && (
            <div className="indicator">
              {questions.map((q, index) => {
                return (
                  <span
                    className="indicator-item"
                    style={{
                      backgroundColor: indicatorBg(index)
                    }}
                  />
                );
              })}
            </div>
          )}
          <Results
            wrong={wrong.value}
            correct={correct.value}
            empty={empty.value}
          />
          <button
            className="restart-button"
            onClick={() => handleRestartClick()}
          >
            Restart Quiz
          </button>
        </div>
      </div>
      <div className="game-area">
        {questions[question.value] && (
          <Question
            data={questions[question.value]}
            buttonText={
              question.value !== totalQuestion ? "Next Question" : "Finish Quiz"
            }
            onQuestionButtonClick={handleNewQuestionClick}
          />
        )}

        {!questions[question.value] && (
          <>
            <QuestionCorrection data={questions} />
          </>
        )}
      </div>
    </div>
  );
}

render(<App />, document.querySelector("#app"));

              
            
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999px

Console