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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 Base

About CSS Base

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HTML 

              
                <!DOCTYPE html>
<html lang="en-GB">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Rock, Paper, Scissors Game</title>
    <link rel="stylesheet" href="mobile.css" />
    <!-- Don't use web fonts in future, download fonts instead -->
    <link href="https://fonts.googleapis.com/css?family=Play:400,700" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Roboto+Condensed:700" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700" rel="stylesheet">
  </head>
  <body>
    <div class="container">
      <header class="header">
        <div class="header__container">
          <h1 class="header__title">Rock Paper Scissors</h1>
        </div>
      </header>
      <main>
        <div class="main__container">
          <!-- Used data-behavior instead of classes or ids for JavaScript -->
          <p class="user--prompt" data-behavior="game_winner">Choose a weapon, Rock, Paper or Scissors!</p>
          <div class="img--choices" data-behavior="game_actions">
            <button class="rock__img" data-behavior="button_clicked" value="rock"></button>
            <button class="paper__img" data-behavior="button_clicked" value="paper"></button>
            <button class="scissors__img" data-behavior="button_clicked" value="scissors"></button>
          </div>
          <div class="img--choices__reset" data-behavior="game_actions--reset">
            <button class="reset__button" data-behavior="game_reset" onclick="refreshPage()">Play Again!</button>
          </div>
          <div class="scoreboard">
            <div style="margin-left: auto; width: 400px;">
              <div class="player--score">
                <p class="players__score" data-behavior="players_score">0</p>
              </div>
              <p class="score__label--player">Player score</p>
            </div>
            <div style="margin-right: auto; width: 400px;">
              <div class="computer--score">
                <p class="computers__score" data-behavior="computers_score">0</p>
              </div>
              <p class="score__label--computer">Computer score</p>
            </div>
          </div>
          <p class="round--result" data-behavior="round_result">Click on a weapon.</p>
        </div>
      </main>
      <footer>
        <div class="footer__container">
          <h2>Lets Play!</h2>
        </div>
      </footer>
    </div>
    <script>
      // Selects each of the buttons with images using querySelectorAll
      const gameActions = document.querySelectorAll("[data-behavior='button_clicked']")
      
      // Links the buttons to the playGame function
      gameActions.forEach((button) => {
        button.addEventListener('click', (event) => {
          // Links the buttons to the playGame function using target and value 
          playGame(event.target.value)
        })
      })
      
      // Resets the game using a button 
      const restartGame = document.querySelector("[data-behavior='game_reset']")

      restartGame.addEventListener('click', () => {
        location.reload()
      })

      let playerWins = 0
      let computerWins = 0
      let ties = 0
      // Used instead of a number directly in determineWinner, can be changed to any number easily this way
      const noOfPointsToWin = 5
      const computerOptions = ['rock', 'paper', 'scissors']
      
      // Math.floor returns numbers 0, 1, 2 for the random numbers 
      const playGame = (userChoice) => {
        const computerChoice = computerOptions[Math.floor(Math.random() * 3)]
        compareSelections(userChoice, computerChoice)
        determineWinner(playerWins, computerWins)
      }
      
      // Compares player selection to computer selection
      const compareSelections = (playerSelection, computerSelection) => {
        if (playerSelection === computerSelection) {
          ties++
          document.querySelector("p[data-behavior='round_result']").innerHTML = "It's a draw!"
        } else if ((playerSelection === 'rock' && computerSelection === 'scissors') ||
                  (playerSelection === 'paper' && computerSelection === 'rock') ||
                  (playerSelection === 'scissors' && computerSelection === 'paper')) {
          playerWins++
          document.querySelector("p[data-behavior='round_result']").innerHTML = 'Player Wins!'
        } else {
          computerWins++
          document.querySelector("p[data-behavior='round_result']").innerHTML = 'Computer Wins!'
        }
        
        // Updates the score on the scoreboard
        document.querySelector("p[data-behavior='players_score']").innerHTML = playerWins
        document.querySelector("p[data-behavior='computers_score']").innerHTML = computerWins
      }

      const determineWinner = (playerWins, computerWins) => {
        if (playerWins === noOfPointsToWin || computerWins === noOfPointsToWin) {
          const winner = playerWins === noOfPointsToWin ? 'Player' : 'Computer'
          
          // Changes text to show who won the game
          document.querySelector("p[data-behavior='game_winner']").innerHTML = `${winner} won the game! Play again?`
          // Removes the div containing the button images
          document.querySelector("div[data-behavior='game_actions']").style.display = "none"
          // Replaces the game_actions div with a button to restart the game
          document.querySelector("button[data-behavior='game_reset']").style.display = "block"
        }
      }
    </script>
  </body>
</html>
!

CSS 

              
                /* Reset
=================================================*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
  display: block;
}

body {
  line-height: 1;
}

ol, ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

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

/* Base Styles
=================================================*/
body {
  background-color: blanchedalmond;
  font-size: 16px;
}

.container {
  max-width: 405px;
  margin: 0 auto;
  padding: 25px;
}

h1 {
  text-align: center;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 2.2em;
  font-weight: 700;
  color: #bb6e16;
  padding-top: 10px; 
}

h2 {
  text-align: center;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 1.5em;
  font-weight: 700;
  color: blanchedalmond;
  padding: 10px 0 10px 0; 
}

p {
  text-align: center;
  font-family: 'roboto', sans-serif;
  font-size: 1.em;
  font-weight: 600;
  color: #521806;
  padding-bottom: 25px;
}

.user--prompt {
  font-size: 1.5em;
  line-height: 1.3;
  padding-top: 15px;
}

footer {
  background-color: #bb6e16;
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
}

/* Images
=================================================*/
.rock__img, .paper__img, .scissors__img {
  width: 130px;
  height: 130px;
  border: 0;
  outline: none;
}

.rock__img {
  background: url(https://res.cloudinary.com/dnobvlm11/image/upload/v1561714188/Rock%20Paper%20Scissors/images/rock_n3fgbe.svg);
  float: left;
  margin-left: 105px;
  margin-bottom: 15px;
}

.paper__img {
  background: url(https://res.cloudinary.com/dnobvlm11/image/upload/v1561714188/Rock%20Paper%20Scissors/images/paper_euwuv0.svg);
  float: left;
  margin-left: 30px;
}

.scissors__img {
  background: url(https://res.cloudinary.com/dnobvlm11/image/upload/v1561714188/Rock%20Paper%20Scissors/images/scissors_nlzpsd.svg);
}

.rock__img:hover, .paper__img:hover, .scissors__img:hover {
  cursor: pointer;
}

.img--choices {
  width: 340px;
  text-align: center;
  margin: 0 auto;
}

/* Scoreboard
=================================================*/
.scoreboard {
  display: flex;
  justify-content: center;
  margin-top: 25px;
}

.player--score {
  display: block;
  width: 75px;
  height: 50px;
  background-color: #8a280a;
  float: right;
  margin-right: 15px;
  border-radius: 10px;
}

.computer--score {
  display: block;
  width: 75px;
  height: 50px;
  background-color: #8a280a;
  float: left;
  border-radius: 10px;
  margin-left: 15px;
}

.computer--score p {
  font-family: 'Play', sans-serif;
  font-weight: 700;
  font-size: 2em;
  color: #fff;
  text-align: center;
  vertical-align: middle; 
  line-height: 45px;
}

.player--score p {
  font-family: 'Play', sans-serif;
  font-weight: 700;
  font-size: 2em;
  color: #fff;
  text-align: center;
  vertical-align: middle; 
  line-height: 45px;
}

.round--result {
  font-family: 'roboto', sans-serif;
  font-size: 1.6em;
  margin-top: 10px;
}

.score__label--player {
  font-family: 'roboto', sans-serif;
  font-size: 0.8em;
  font-weight: 600;
  padding-top: 10px;
  padding-right: 5px;
  margin-right: 15px;
  float: right;
  text-align: center;
  vertical-align: middle;
}

.score__label--computer {
  display: inline-block;
  font-family: 'roboto', sans-serif;
  font-size: 0.8em;
  font-weight: 600;
  padding-top: 10px;
  padding-left: 5px;
  padding-bottom: 15px;
  margin-left: 15xp;
  text-align: center;
  vertical-align: middle;
}

/* Buttons
=================================================*/
.start__btn {
  display: block;
  margin: 0 auto;
  margin-top: 35px;
  width: 200px;
  height: 35px;
  border-radius: 10px;
  background-color: #bb6e16;
  color: #fff;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 1.6em;
  outline: none;
}

.start__btn:hover {
  cursor: pointer;
}

.reset__btn {
  display: block;
  margin: 20px auto;
  width: 200px;
  height: 35px;
  border: 1px solid rgb(255, 215, 155);
  border-radius: 10px;
  background-color: #521806;
  color: #fff;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 1.6em;
  outline: none;
}

.reset__btn:hover {
  cursor: pointer;
}

/* Main reset button */
.reset__button {
  display: block;
  width: 300px;
  height: 70px;
  border: 1px solid rgb(255, 215, 155);
  border-radius: 10px;
  background-color: #521806;
  color: #fff;
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 2em;
  outline: none;
  margin: 103px auto 103px;
  display: none;
}

.reset__button:hover {
  cursor: pointer;
}

@media only screen and (min-width: 376px) {
  .container {
    max-width: 767px;
    margin: 0 auto;
    padding: 25px;
  }

  h1 {
    font-size: 2.5em; 
  }

  .user--prompt {
    font-size: 1.7em;
    line-height: 1.3;
    padding-top: 25px;
  }

  .img--choices {
    padding: 35px 0 25px 0;
    width: 360px;
  }

  .rock__img, .paper__img, .scissors__img {
    width: 150px;
    height: 150px;
  }

  .rock__img {
    margin-bottom: 25px;
  }
  
  .paper__img {
    clear: both;
    float: left;
    margin-left: 20px;
    margin-right: 20px;
  }

  .scoreboard {
    display: flex;
    justify-content: center;
    margin: 25px 0;
  }

  .round--result {
    font-size: 1.8em;
    padding-top: 15px;
  }

  .score__label--player {
    font-family: 'roboto', sans-serif;
    font-size: 0.9em;
    font-weight: 600;
    padding-top: 10px;
    padding-right: 5px;
    margin-right: 15px;
    float: right;
    text-align: center;
    vertical-align: middle;
  }
  
  .score__label--computer {
    display: inline-block;
    font-family: 'roboto', sans-serif;
    font-size: 0.9em;
    font-weight: 600;
    padding-top: 10px;
    padding-left: 5px;
    padding-bottom: 15px;
    margin-left: 15xp;
    text-align: center;
    vertical-align: middle;
  }

  .scoreboard {
    display: flex;
    justify-content: center;
    margin-top: 25px;
    max-width: 340px;
    margin: 0 auto;
  }
}

@media only screen and (min-width: 768px) {
  .container {
    max-width: 767px;
    margin: 0 auto;
    padding: 25px;
  }

  .header__container {
    max-width: 767px;
    margin: 0 auto;
  }

  .main__container {
    max-width: 767px;
    margin: 0 auto;
  }
  
  h1 {
    font-size: 4em;
    padding-bottom: 25px;
    text-align: center;
  }

  .user--prompt {
    font-size: 1.8em;
    line-height: 1.3;
    padding-top: 15px;
  }

  p {
    font-size: 2.2em;
    padding-bottom: 25px;
  }

  .img--choices {
    width: 725px;
    margin: 0 auto;
    padding-top: 50px;
  }

  .rock__img, .paper__img, .scissors__img {
    width: 175px;
    height: 175px;
  }

  .rock__img {
    float: none;
    margin: 0 50px 0 0;
  }
  
  .paper__img {
    float: none;
    margin-right: 50px;
  }
  
  .scissors__img {
    float: none;
  }
  
  .scoreboard {
    clear: both;
    display: flex;
    justify-content: center;
    padding-top: 50px;
    margin: 0 auto;
    width: 760px;
  }
  
  .player--score {
    display: inline-block;
    width: 100px;
    height: 75px;
    background-color: #8a280a;
    float: right;
    margin-right: 20px;
    border-radius: 10px;
  }
  
  .computer--score {
    display: inline-block;
    width: 100px;
    height: 75px;
    background-color: #8a280a;
    float: left;
    border-radius: 10px;
    margin-left: 20px;
  }
  
  .computer--score p {
    font-family: 'Play', sans-serif;
    font-weight: 700;
    font-size: 2.4em;
    color: #fff;
    text-align: center;
    vertical-align: middle; 
    line-height: 70px;
  }
  
  .player--score p {
    font-family: 'Play', sans-serif;
    font-weight: 700;
    font-size: 2.4em;
    color: #fff;
    text-align: center;
    vertical-align: middle; 
    line-height: 70px;
  }
  
  .round--result {
    font-family: 'roboto', sans-serif;
    font-size: 1.6em;
    margin-top: 20px;
  }
  
  .score__label--player {
    font-family: 'roboto', sans-serif;
    font-size: 1em;
    font-weight: 600;
    padding-top: 10px;
    margin-right: 20px;
    vertical-align: middle;
  }
  
  .score__label--computer {
    display: inline-block;
    font-family: 'roboto', sans-serif;
    font-size: 1em;
    font-weight: 600;
    padding-top: 10px;
    margin-left: 10px;
    vertical-align: middle;
  }

  .round--result {
    padding-top: 25px;
    font-size: 2.3em;
  }
}

@media only screen and (min-width: 960px) {
  .container {
    width: 960px;
    max-width: 960px;
    margin: 0 auto;
    padding: 25px;
  }
  
  .header__container {
    width: 960px;
    margin: 0 auto;
    padding: 0 30px;
  }
  
  .main__container {
    width: 960px;
    margin: 0 auto;
    padding: 0 30px;
  }
  
  .footer__container {
    width: 960px;
    margin: 0 auto;
    padding: 0 30px;
  }
  
  h1 {
    font-size: 4.5em;
    padding-bottom: 15px;
  }

  p {
    font-size: 2.5em;
    padding-bottom: 25px;
  }

  .img--choices {
    max-width: 960px;
    text-align: center;
    margin: 0 auto;
  }

  .rock__img, .paper__img, .scissors__img {
    width: 200px;
    height: 200px;
  }

  .rock__img {
    margin-right: 45px;
    padding: 0;
    display: inline-block;
  }
  
  .paper__img {
    margin-right: 45px; 
    padding: 0;
    display: inline-block;
  }
  
  .scissors__img {
    margin: 0;
    padding: 0;
    display: inline-block;
  }

  .user--prompt {
    font-size: 2.3em;
  }

  .scoreboard {
    padding-top: 15px;
    width: 1280px;
  }
}

@media only screen and (min-width: 1280px) {
  .container {
    width: 1280px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 25px;
  }

  .header__container {
    width: 1280px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 30px;
  }
  
  .main__container {
    width: 1280px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 30px;
  }
  

  .footer__container {
    width: 1280px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 30px;
  }

  .img--choices {
    width: 1280px;
    text-align: center;
    margin: 0 auto;
    padding-top: 15px;
  }
  
  h1 {
    font-size: 5em;
  }

  h2 {
    margin: 0 auto;
    padding-left: 70px;
  }

  .user--prompt {
    font-size: 2.3em;
    padding-top: 15px;
  }

  .rock__img, .paper__img, .scissors__img {
    width: 250px;
    height: 250px;
  }

  .rock__img {
    margin-right: 20px;
    padding: 0;
    display: inline;
  }
  
  .paper__img {
    margin-right: 20px; 
    padding: 0;
    display: inline;
    margin: 0 75px;
  }
  
  .scissors__img {
    outline: none;
    margin: 0;
    padding: 0;
    display: inline;
  }

  .round--result {
    padding-top: 5px;
    font-size: 2.3em;
  }
}
!

JS 

              
                function refreshPage() {
  window.location.href = window.location.href;
}
!
999px

Console