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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              // checkbox to turn CSSimon on or off
<input type="checkbox" id="cb-onoff" hidden />

// radio buttons to indicate the id of the sequence (one only for now)
<input type="radio" id="sequence-0" class="sequence" name="sequence" checked hidden />

// radio buttons that indicate current round within the sequence
- var r = 0;
while r < 31
  input(type="radio", id="round-"+r, class="round", name="round", checked=(r==0), value=r++, hidden)

// radio buttons to keep track of the current step within the round
- var r = 0;
while r < 31
  - var s = 0;
  while s <= r
    input(type="radio", id="round-"+r+"-step-"+s, name="round-"+r, checked=(s==0), value=s++, hidden)
  - r++

// radio buttons to detect if a mistake was made by the player
<input type="radio" id="correct" name="correct-incorrect" checked hidden/>
<input type="radio" id="incorrect" name="correct-incorrect" hidden />

// CSSimon board
<div id="simon">
  // four incorrect buttons
  <label class="button button-1 incorrect" for="incorrect"></label>
  <label class="button button-2 incorrect" for="incorrect"></label>
  <label class="button button-3 incorrect" for="incorrect"></label>
  <label class="button button-4 incorrect" for="incorrect"></label>
  
  // sequence of labels for right steps for each round
  - var sequence = [1,2,3,4,1,1,3,4,2,3,1,2,4,3,3,2,4,1,1,4,4,4,2,3,2,1,4,2,3,1];
  - var r = 0;
  while r < 31
    - var s = 0;
    while s <= r
      if (r == s)
        label(class="button button-"+sequence[s]+" correct round-"+r+" step-"+s, for="round-"+(r+1))
      else 
        label(class="button button-"+sequence[s]+" correct round-"+r+" step-"+s, for="round-"+r+"-step-"+(s+1))
      - s++
    - r++
  <!-- 1 2 3 4 1 1 3 4 2 3 1 2 4 3 3 2 4 1 1 4 4 4 2 3 2 1 4 2 3 1 -->
  
  // center of board
  <div id="center">
    <div id="card">
      <h1>CSSimon</h1>
      <h2>by Alvaro Montoro</h2>
      <div id="onoff">
        <label id="switch" for="cb-onoff"></label>
      </div>
    </div>
  </div>
  <div id="protector"></div>
</div>

// game over message
<div id="gameover">
  <div>Oh no! You Lost!</div>
  <div>Reload the page to start again!</div>
</div>

// game over message
<div id="youwon">
  <div>Yes! You Won!</div>
  <div>Reload the page to start again!</div>
</div>
            
          
!
            
              @import url('https://fonts.googleapis.com/css?family=Exo+2:400,900');

html,body {
 background: #ccc;  
}

#gameover, #youwon {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background: rgba(0,0,0,0.7);
  color: white;
  display: none;
  div {
    text-align: center;
    margin: 3vmin;
    font-size: 4vmin;
    font-family: "exo 2", "exo2", "exo", arial, sans-serif;
  }
}

#simon {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  width: 50vmin;
  height: 50vmin;
  background: #333;
  border-radius: 100%;
  box-shadow: inset 0.5vmin 0.5vmin 0.75vmin rgba(255,255,255,0.2),
              inset 1vmin 1vmin 0.75vmin rgba(0,0,0,0.15),
              inset -0.5vmin -0.5vmin 0.75vmin rgba(0,0,0,0.2),
              inset -0.75vmin -0.75vmin 0.75vmin rgba(255,255,255,0.1),
              0.5vmin 0.5vmin 1.5vmin rgba(0,0,0,0.2);
  overflow: hidden;
  aborder: 2vmin outset rgba(255,255,255,0.1);
  box-sizing: border-box;
}

#protector {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  z-index: 4;
}

#center, #card {
  width: 40%;
  height: 40%;
  background: #333;
  position: absolute;
  border-radius: 100%;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  z-index: 5;
}

#card {
  width: 80%;
  height: 80%;
  background: #bbb;
  text-align: center;
}

#onoff {
  position: absolute;
  width: 30%;
  height: 15%;
  background: #222;
  border-radius: 1000px;
  position: absolute;
  top: 65%;
  left: 35%;
  box-shadow:inset 0 0 10px 0 black;
}

#switch {
  position: absolute;
  top: 7%;
  left: 7%;
  width: 43%;
  height: 86%;
  background: #999;
  border-radius: 100%;
  display: inline-block;
  transition: left 0.5s;
  cursor: pointer;
}

#cb-onoff:checked ~ #simon #switch {
  left: 53%;
}

h1, h2 {
  font-family: "exo 2", "exo2", "exo", arial, sans-serif;
  font-size: 3vmin;
  margin-top:0;
  position: absolute;
  top: 35%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  color: #222;
  font-weight: 900;
  user-select: none;
}

h2 {
  font-size: 1.5vmin;
  top: 50%;
  font-weight: 400;
  white-space: nowrap;
}

#simon label.button {
  position: absolute;
  width: 43%;
  height: 43%;
  border: 0;
  box-shadow: 2px 2px 4px rgba(0,0,0,0.2);
  outline: none;
  cursor: pointer;
  transition: all 0.25s;
  animation-timing-function: linear;
  animation-fill-mode: backwards;
  animation-delay: 0.5s;
}

label.button.incorrect {
  z-index: 2;
}

label.button.correct {
  z-index: 1;
  background: transparent;
  box-shadow: 0 0 0 0 rgba(0,0,0,0) !important;
}

.button-1 { 
  top: 5%; 
  left: 5%; 
  border-radius: 100% 2% 2% 2%;
  background: #4c6;
  box-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}
.button-2 { 
  top: 5%; 
  right: 5%; 
  border-radius: 2% 100% 2% 2%;
  background: #c44;
}
.button-3 { 
  bottom: 5%; 
  left: 5%; 
  border-radius: 2% 2% 2% 100%;
  background: #dd6;
}
.button-4 { 
  bottom: 5%; 
  right: 5%; 
  border-radius: 2% 2% 100% 2%;
  background: #46c;
}

#cb-onoff:checked {
  ~ #simon {
    .button-1:active { background: #6e8; }
    .button-2:active { background: #e66; }
    .button-3:active { background: #ff8; }
    .button-4:active { background: #68e; }
    #protector { z-index: 1; }
  }
  @for $i from 0 through 10 { // 30 {
    @for $s from 0 through $i {
      ~ #round-#{$i}:checked ~ #round-#{$i}-step-#{$s}:checked ~ #simon .round-#{$i}.step-#{$s} { z-index: 3; }
    }
  }
}

$sequence: 1 2 3 4 1 1 3 4 2 3 1 2 4 3 3 2 4 1 1 4 4 4 2 3 2 1 4 2 3 1;
$colors: #4c6 #7f9, #c44 #f77, #dd6 #ff9, #46c #79f;
@each $i in [1,2,3,4] {
  @for $s from 1 through 30 {
     @keyframes sequence-0-step-#{$s - 1}-button-#{$i} {
       0% { background: nth(nth($colors, $i), 1); }
       @for $m from 1 through $s {
         #{100 * ($m - 1) / $s + 1}% { 
           @if nth($sequence, $m) == $i {
             background: nth(nth($colors, $i), 2);
           } @else {
             background: nth(nth($colors, $i), 1); 
           }
         }
         #{100 * $m / $s - 1}% { 
           @if nth($sequence, $m) == $i {
             background: nth(nth($colors, $i), 2);
           } @else {
             background: nth(nth($colors, $i), 1);
           }
         }
         #{100 * $m / $s - 0.5}% { 
           background: nth(nth($colors, $i), 1);
         }
       }
       100% { background: nth(nth($colors, $i), 1); }
    }
  }
}

// 1,2,3,4,1
@for $s from 0 through 0 {
  @for $i from 0 through 30 {
    @for $j from 1 through 4 {
      #cb-onoff:checked ~ #sequence-#{$s}:checked ~ #round-#{$i}:checked ~ #simon .button-#{$j} { 
        animation-name: sequence-#{$s}-step-#{$i}-button-#{$j};
        animation-duration: #{$i*0.5 + 1}s;
      }
    }
  }
}

@for $i from 0 through 1 {
  @keyframes protect-buttons-#{$i} {
    0% { z-index: 1 }
    1% { z-index: 4 }
    99% { z-index: 4 }
    100% { z-index: 1 }
  }
}

@for $s from 0 through 0 {
  @for $i from 0 through 30 {
    #cb-onoff:checked ~ #sequence-#{$s}:checked ~ #round-#{$i}:checked ~ #simon #protector {
      animation-name: protect-buttons-#{$i % 2};
      animation-duration: #{$i*0.5 + 1.5}s;
    }
  }
}

#incorrect:checked ~ {
  #simon #protector {
    z-index: 5;
  }
  #gameover {
    display: block;
  }
}

#round-30:checked ~ #youwon {
  display: block;
}

@each $i in [1,2,3,4] {
  @keyframes incorrect-button-#{$i} {
    0% { background: nth(nth($colors, $i), 2) }
    20% { background: nth(nth($colors, $i), 2) }
    21% { background: nth(nth($colors, $i), 1) }
    40% { background: nth(nth($colors, $i), 1) }
    41% { background: nth(nth($colors, $i), 2) }
    60% { background: nth(nth($colors, $i), 2) }
    61% { background: nth(nth($colors, $i), 1) }
    80% { background: nth(nth($colors, $i), 1) }
    81% { background: nth(nth($colors, $i), 2) }
    99% { background: nth(nth($colors, $i), 2) }
    100% { background: nth(nth($colors, $i), 1) }
  }
  #incorrect:checked {
    ~ #simon .button-#{$i} {
      animation-delay: 0s;
      animation-name: incorrect-button-#{$i} !important;
      animation-duration: 1s !important;
    }
  }
}
            
          
!
            
              // https://i.imgur.com/YsbKHg1.gif
            
          
!
999px
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