Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                link(href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;500&display=swap", rel="stylesheet")

// secret codes
- var codes = ["6543", "1324", "4135", "5614"];
- var rounds = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
- var numrounds = 10;
- var slots = [1, 2, 3, 4];

form
  label#info(for="hideInit") i
  input(id="color-blind", type="checkbox")
  label#color-blind-label(for="color-blind") Add letters
  // rounds
  div#board
    h1#mastermind MASTERMIND
    each val in codes
      input(type="radio", tabindex=-1, value=val, name="code", id="code-"+val, checked=(val === "6543"))

    each round in rounds
      input(type="checkbox", tabindex=-1, id="completed-"+round, class="completed")
      input(type="radio", tabindex=-1, id="round-"+round, name="round")
      each val in slots
        each color in [1,2,3,4,5,6]
          input(type="radio", tabindex=-1, value=color, name="slot-"+val+"-round-"+round, id="slot-"+val+"-round-"+round+"-color-"+color)
      div(class="round-container round-"+round)
        label(for="completed-"+round) 
          span NEXT
        each num in [1,2,3,4]
          a(href="#round-"+round+"-slot-"+num, tabindex=0, class="slot-circle slot-"+num+"-round-"+round+"-trigger")
        div(class="valid valid-"+round)
          each num in [1,2,3,4]
            div(class="correct-"+num)
          each num in [1,2,3,4]
            div(class="partial-"+num)
          each num in [1,2,3,4]
            div(class="empty-"+num)

    input(type="radio", value=val, name="round", id="round-"+(numrounds+1))
    
    input(type="checkbox", id="hideInit")
    #init.popup
      div
        h1 Let's play CSS Mastermind!
        p 
          |  
          a(href="https://en.wikipedia.org/wiki/Mastermind_(board_game)",target="_blank") Mastermind 
          | is a challenging code-breaking game. There are 6 colors and a 4-length code to decipher. Can you break the code? 
        p Select the colors for each code peg by clicking in an active slot. When you are ready, click on the "Next" button on the left side of the active round.
        p The results will be displayed using key pegs on the right. A black key peg indicates that a color is in the right place, while a white key peg indicates that a color is present but not in the right place.
        p.games Pick a game to play:
        p.games
          each val in codes
            label(class="close", for="code-"+val, class="game-selector") Game
        div#start-button
          label(for="round-1", class="green-button") START GAME
        label.close(for="hideInit") Close
          
    div.lost.popup 
      div 
        h2 Game Over!
        p Oh, no! You reach the end of the game before cracking the code... Click on the button to try again!
        div
          input(type="reset", value="Play again", class="green-button")
    div.won.popup
      div 
        h2 Congratulations! You won!
        p Yay! You are amazing and cracked the code successfully! Click on the button below to restart the game.
        div
          input(type="reset", value="Play again", class="green-button")
          
    div#confetti
      - n = 1;
      while n < 100
        div(class="confetti confetti-"+n)
        - n++

    each round in rounds
      div(id="transition-"+round, class="popup transition")
        div
          h2 Not there yet!
          p Review the hints on the right side and make some changes in the next round.
          div
            label(for="round-"+(round+1), class="close") Next round!
      each num in [1,2,3,4]
        div(id="round-"+round+"-slot-"+num, class="popup") 
          div 
            h2 Round #{round} Slot #{num}
            div.color-labels
              each color in [1,2,3,4,5,6]
                label(for="slot-"+num+"-round-"+round+"-color-"+color,tabindex=1)
            a(href="#", class="close") Close





              
            
!

CSS

              
                $fullcodes: '6543', '1324', '4135', '5614';
$codes: '6' '5' '4' '3', '1' '3' '2' '4', '4' '1' '3' '5', '5' '6' '1' '4';
$rounds: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;
$num-rounds: 10;
$slots: 1, 2, 3, 4;
$color-number: 1, 2, 3, 4, 5, 6;
$colors: '#7dd', '#096', '#f40', '#ee0', '#eee', '#d49';
$color-letters: 'B', 'G', 'O', 'Y', 'W', 'P';
$board-primary: #de8f65;
$board-secondary: #5ccfa0;

* {
  font-family: Roboto, Arial, sans-serif;
}

input:not([type=reset]) {
  position: absolute;
  left: -10000em;
}

html {
  display: table-row;
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  display: table-cell;
  text-align: center;
  vertical-align: middle;
}

h1 {
  margin: 0;
  padding: 0;
  margin-bottom: 10px;
  font-size: 24px;
}

p {
  font-weight: 300;
}

.won, 
.lost,
.won:is(:visible) ~ .popup { 
  display: none; 
}

#round-#{$num-rounds + 1}:checked ~ .lost {
  display: flex;
}

#board {
  position: relative;
  width: 380px;
  overflow: visible;
  margin: 35px auto;
  display: block;
  padding: 80px 0;
  background: #{$board-primary};
  border-radius: 15px;
  box-shadow: inset 1px 1px 3px #{$board-primary}, inset -4px 2px 8px -2px rgba(0,0,0,0.15), inset 4px 4px 8px rgba(255,255,255,0.35), inset -4px -4px 8px -2px rgba(0,0,0,0.15), inset 4px 0 8px -2px rgba(255,255,255,0.35);

  &::before {
    content: "";
    display: block;
    position: absolute;
    bottom: 0px;
    left: 50px;
    width: 180px;
    height: 60px;
    background: #{$board-secondary};
    box-sizing: border-box;
    border: 1px solid rgba(0,0,0, 0.2);
    border-radius: 3px 3px 1px 1px;
    box-shadow: inset 0 -4px 6px rgba(0,0,0,0.15), inset 1px 1px rgba(255,255,255,0.3), inset -1px 1px rgba(255,255,255,0.3);
  }
}

#color-blind-label {
  position: fixed;
  top: 10px;
  right: 10px;

  &::before {
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    border-radius: 50%;
    border: 2px solid #369;
    vertical-align: bottom;
    margin-right: 0.25em;
    box-shadow: inset 0 0 0 9in #fff;
  }
}

#color-blind:checked + label::before {
  box-shadow: inset 0 0 0 2px #fff, inset 0 0 0 9in #369;
}

#mastermind {
  margin: 0;
  padding: 0;
  width: 520px;
  height:100px;
  position: absolute;
  right: 0;
  top: -20px;
  transform: rotate(-90deg);
  transform-origin: bottom right;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 70px;
  font-weight: bold;
  letter-spacing: 2px;
  color: lighten($board-secondary, 2.5%);
  text-shadow: 1px -1px 1px rgba(255,255,255,0.4), -1px 1px 1px rgba(0,0,0,0.3);
  box-sizing: border-box;
  background: linear-gradient(45deg, #{$board-secondary}, darken($board-secondary, 5%));
  border: 1px solid rgba(0,0,0, 0.2);
  border-bottom: 0;
  border-radius: 3px 3px 1px 1px;
  box-shadow: inset 0 -4px 6px rgba(0,0,0,0.15), inset 1px 1px rgba(255,255,255,0.3), inset -1px 1px rgba(255,255,255,0.3);

  &::before, &::after {
    content: "";
    display: block;
    position: absolute;
    top: 77px;
    right: -5px;
    width: 5px;
    height: 15px;
    background: rgba(0,0,0,0.35);
    border-radius: 0 2px 2px 0;
    box-shadow: inset -1px 0 2px rgba(0,0,0,0.25);
  }

  &::after {
    right: auto;
    left: -5px;
    border-radius:  2px 0 0 2px;
    box-shadow: inset -1px 0 2px rgba(0,0,0,0.25);
  }
}

// confetti effect based on Fionna's https://codepen.io/fionnachan/pen/EvaqOB
#confetti {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: none;
  pointer-events: none;
  z-index: 3;

  .confetti {
    position: absolute;
  }
}

@for $i from 1 through 99 {
  $w: random(12);
  $l: random(100);
  .confetti-#{$i} {
    width: #{$w}px;
    height: #{$w*0.6}px;
    background-color: #{nth($colors, random(6))};
    top: -10%;
    left: unquote($l+"%");
    opacity: random() + 0.5;
    transform: rotate(#{random()*360}deg);
    animation: drop-#{$i} unquote(4+random()+"s") unquote(random()+"s") infinite;
    animation-delay: -#{random()*10}s;
  }

  @keyframes drop-#{$i} {
    100% {
      top: 110%;
      left: unquote($l+random(15)+"%");
    }
  }
}

.round-container {
  border-bottom: 1px solid darken($board-primary, 10%);
  border-top: 1px solid lighten($board-primary, 10%);
  padding: 5px 10px;
  position: relative;
  width: 260px;
  height: 40px;

  &.round-1 {
    border-top: 1px solid darken($board-primary, 10%);
    box-shadow: inset 0 1px lighten($board-primary, 10%);
  }

  &.round-10 {
    border-bottom: 1px solid lighten($board-primary, 10%);
    box-shadow: inset 0 -1px darken($board-primary, 10%);
  }

  & label {
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    display: inline-block;
    visibility: hidden;
    pointer-events: none; // the buttons are not clickable
    float: left;
    margin-right: 10px;
    font-size: 12px;
    color: darken($board-primary, 20%);
    font-weight: bold;
    cursor: pointer;
    box-sizing: border-box;
    border: 1px solid transparent;
    position: relative;

    &:hover {
      color: darken($board-primary, 25%);

      &::before {
        content:"";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        background: rgba(255,255,255,0.2);
        clip-path: polygon(50% 100%, 15% 73%, 37% 73%, 37% 0%, 63% 0%, 63% 73%, 85% 73%);
      }
    }

    span {
      position: relative;
    }
  }

  .slot-circle {
    margin: 10px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    float: left;
    background: rgba(0,0,0,0.3);
    box-shadow: inset 3px 3px 3px rgba(0,0,0,0.3), inset -1px -1px 2px rgba(0,0,0,0.125);
    pointer-events: none;
  }
}

.valid {
  width: 40px;
  height: 40px;
  opacity: 1;
  overflow: hidden;
  padding-left: 10px;
  position: relative;
  boz-sizing: border-box;
}

[class^=correct], [class^=partial], [class^=empty] {
  background: #222;
  display: none;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  float: left;
  box-sizing: border-box;
  margin: 2px;
  box-shadow: inset -1px -1px 0 rgba(0,0,0,1),inset -1px -1px 4px rgba(255,255,255,0.15), inset 1px 1px 0 rgba(255,255,255,0.2), inset 1px 1px 4px rgba(0,0,0,0.2), 1px 1px 2px rgba(0,0,0,0.4);
}

[class^=empty] {
  width: 20px;
  height: 20px;
  background: rgba(0,0,0,0.4);
  display: inline-block;
  margin: 0;
  border: 4px solid $board-primary;
  box-shadow: inset 2px 2px 4px rgba(0,0,0,0.3);;
}

[class^=partial] {
  background: white;
  box-shadow: inset -1px -1px 0 rgba(0,0,0,0.1), inset 1px 1px 0 #fff, inset 1px 1px 4px rgba(0,0,0,0.2), 1px 1px 2px rgba(0,0,0,0.4);
}

#info {
  width: 24px;
  height: 24px;
  background: #369;
  border-radius: 50%;
  position: fixed;
  top: 5px;
  left: 5px;
  z-index: 1;
  line-height: 24px;
  text-align: center;
  display: inline-block;
  color: white;
  font-style: italic;
  font-family: serif;
  cursor: pointer;

  &:hover {
    background: #47a;
  }
}

#init {
  display: flex;
}

.popup > div {
  clip-path: polygon(0% 2%, 2% 3%, 0% 0%, 3% 2%, 2% 0%, 50% 1%, 98% 0%, 97% 2%, 100% 0%, 98% 3%, 100% 2%, 99% 50%, 100% 98%, 98% 97%, 100% 100%, 97% 98%, 98% 100%, 50% 99%, 2% 100%, 3% 98%, 0% 100%, 2% 97%, 0% 98%, 1% 50%);
  max-height: 80vh;
  overflow: auto;
}

#init #start-button + label {
  display: none;
}

[id^=round-]:checked ~ #init,
[id^=round-]:checked ~ #init .games,
[id^=round-]:checked ~ #init #start-button {
  display: none;
}

#hideInit:checked + .popup,
[id^=round-]:checked ~ #init #start-button + label {
  display: flex;
}

.popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  align-items: center;
  justify-content: center;
  z-index: 1;
  background: rgba(0,0,0,0.2);
  display: none;

  &:target {
    display: flex;
  }

  & > div {
    background: white;
    padding: 30px;
    display: inline-block;
    text-align: left;
    border-radius: 5px;
    max-width: 400px;
    margin: 10px;
  }

  & label {
    display: inline-block;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
  }

  & h2 {
    margin: 0;
    margin-bottom: 10px;
  }

  & .close {
    display: inline-block;
    background: #369;
    color: white;
    padding: 5px 15px;
    text-decoration: none;
    border-radius: 2px;
    float: right;
    margin-top: 10px;
    white-space: nowrap;
    height: auto;
    width: auto;

    &:hover {
      background: #47a;
    }
  }
}

.games {
  display:flex; 
  width: 100%; 
  justify-content: space-between;
  flex-wrap: wrap;

  & label {
    width: auto;
    height: auto; 
  }
}

// all the game buttons will have their own ID
@for $i from 1 through length($fullcodes) {
  $code: nth($fullcodes, $i);
  .games label:nth-child(#{$i})::after {
    content: " #{$i}";
  }
  #code-#{$code}:checked ~ #init .games label[for="code-#{$code}"] {
    box-shadow: 0 0 0 2px white, 0 0 0 4px #369;
  }
}

label.green-button,
input.green-button {
  border: 0;
  font-family: Roboto, Arial, sans-serif;
  font-size: 16px;
  border-radius: 2px;
  padding: 10px 15px;
  text-align: center;
  box-sizing: border-box;
  width: 100%;
  height: auto;
  margin-top: 10px;
  background: #0a0;
  color: white;
  text-transform: uppercase;
}

// styling of the code pegs in the selection popup
// thanks @racascou for the suggestions!
.color-labels label,
.round-container a {
  position: relative;

  &::after {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 14px;
    text-shadow: -0.6px -1px 1px rgba(255,255,255,0.4), 1px 0.25px 1px rgba(0,0,0,0.5);
    padding: 4px;
    border: 2px dotted rgba(255,255,255,0.15);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
  }
}
@each $color in $color-number {
  .color-labels label:nth-child(#{$color}) {
    box-shadow: inset 1px 1px 1px rgba(255, 255, 255, 0.3), inset -1px -1px 1px rgba(0, 0, 0, 0.3), inset 0 0 0 4px #{nth($colors, $color)}, inset 3px 3px 6px rgba(0, 0, 0, 0.3), inset -3px -3px 6px rgba(255, 255, 255, 0.3), 0 0 1px black, 1px 1px 2px black;
    background: #{nth($colors, $color)};

    &::after {
      content: "#{nth($color-letters, $color)}";
      color: #{nth($colors, $color)};
    }
  }
}

#color-blind:not(:checked) ~ #board .color-labels label::after {
  display: none;
}

/* Game Logic */
@each $round in $rounds {
  // make the buttons clickable only if current round
  #round-#{$round}:checked ~ div.round-#{$round} {
    label, a {
      visibility: visible;
      pointer-events: auto;
    }
  }

  // detect if a correct answer was given and show win messages
  @each $code in $codes {
    #code-#{nth($code, 1)}#{nth($code, 2)}#{nth($code, 3)}#{nth($code, 4)}:checked ~ input#completed-#{$round}:checked {
      + input[name=round]:checked ~ [name^="slot-1"][value="#{nth($code, 1)}"]:checked ~ [name^="slot-2"][value="#{nth($code, 2)}"]:checked ~ [name^="slot-3"][value="#{nth($code, 3)}"]:checked ~ [name^="slot-4"][value="#{nth($code, 4)}"]:checked {
        ~ .popup {
          display: none;
        }
        ~ .won {
          display: flex;
        }
        ~ #confetti {
          display: block;
        }
      }

      @each $slot in $slots {
        // detects each correcta answer and displays the black dot
        ~ [name="slot-#{$slot}-round-#{$round}"][value="#{nth($code, $slot)}"]:checked ~ .round-container .valid-#{$round} .correct-#{$slot} {
          display: inline-block;
        }

        // detetcs partial answers and displays white dot
        ~ [name="slot-#{$slot}-round-#{$round}"][value="#{nth($code, $slot)}"]:not(:checked) ~ [name^=slot][name$="round-#{$round}"][value="#{nth($code, $slot)}"]:checked ~ .round-container .valid-#{$round},
        ~ [name^=slot][name$="round-#{$round}"][value="#{nth($code, $slot)}"]:checked ~ [name="slot-#{$slot}-round-#{$round}"][value="#{nth($code, $slot)}"]:not(:checked) ~ .round-container .valid-#{$round} {
          .partial-#{$slot} {
            display: inline-block;
          }
        }
      }
    }
  }
}

@each $round in $rounds {  
  #completed-#{$round}:checked + input[name=round]:checked ~ #transition-#{$round} {
    display: flex;
  }

  input#completed-#{$round}:checked,
  input#round-#{$round}:checked {
    @each $slot in $slots {
      ~ [name="slot-#{$slot}-round-#{$round}"]:checked ~ .round-container.round-#{$round} .slot-circle:nth-child(#{$slot + 1}) {
        width: 36px;
        height: 36px;
        margin: 2px;
        border: 0;
      }

      @each $color in $color-number {
        ~ [name="slot-#{$slot}-round-#{$round}"][value="#{$color}"]:checked ~ .round-container.round-#{$round} .slot-circle:nth-child(#{$slot + 1}) {

          box-shadow: inset 1px 1px 1px rgba(255, 255, 255, 0.3), inset -1px -1px 1px rgba(0, 0, 0, 0.3), inset 0 0 0 4px #{nth($colors, $color)}, inset 3px 3px 6px rgba(0, 0, 0, 0.3), inset -3px -3px 6px rgba(255, 255, 255, 0.3), 0 0 2px rgba(0,0,0,0.35), 1px 1px 2px rgba(0,0,0,0.5);
          background: #{nth($colors, $color)};

          #color-blind:checked ~ #board &::after {
            content: "#{nth($color-letters, $color)}";
            color: #{nth($colors, $color)};
          }
        }
      }
    }
  }
}

              
            
!

JS

              
                // No JS :)
              
            
!
999px

Console