html {
    display: table;
    width: 100%;
    height: 100%;
  }
  
  body {
    display: table-row;
    background: #000 radial-gradient(1000px 500px, #3f546b, #000);
  }
  
  .wrapper {
    display: table-cell;
    vertical-align: middle;
    text-align: center;
  }
  
  .content {
    display: inline-block;
    width: 668px;
    margin: 0 auto;
    padding: 10px 20px;
  }
  
  .sidebar {
    float: left;
    margin-right: 20px;
    width: 220px;
    text-align: left;
    font-family: 'Doppio One', sans-serif;
    color: #ccc;
  }
  
  h1,
  h2 {
    color: #fff;
    margin: 0;
    font-weight: normal;
  }
  
  h1 {
    height: 68px;
    line-height: 68px;
    font-size: 40px;
    text-align: right;
  }
  
  h2 {
    font-size: 18px;
  }
  
  .panel {
    padding: 12px;
    margin-bottom: 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
  }
  
  .dif-options {
    clear: both;
    overflow: hidden;
    margin: 20px -7px 0;
  }
  
  .dif-options div {
    float: left;
    width: 20%;
  }
  
  .dif-options input {
    display: none;
  }
  
  .dif-options input:checked+label {
    color: #fff;
    background-color: #593f6b;
    border-color: #fff;
    cursor: default;
  }
  
  .dif-options label {
    display: block;
    margin: 0 auto;
    width: 24px;
    height: 24px;
    background-color: #666;
    border: solid 2px #ccc;
    border-radius: 8px;
    color: #999;
    text-align: center;
    line-height: 24px;
    cursor: pointer;
  }
  
  .freeze .dif-options input:not(:checked)+label {
    font-size: 0;
    margin: 7px auto;
    width: 10px;
    height: 10px;
    border-radius: 4px;
    color: transparent;
    line-height: 10px;
    cursor: default;
    transition: .2s;
  }
  
  .start {
    margin-top: 20px;
  }
  
  .start button {
    display: block;
    width: 100%;
    padding: 2px 12px 4px;
    font-family: inherit;
    font-size: 24px;
    border: solid 2px #ccc;
    border-radius: 8px;
    background-color: #593f6b;
    color: #fff;
    cursor: pointer;
  }
  
  .start button:focus {
    outline: none;
  }
  
  .freeze .start {
    display: none;
  }
  
  .info div {
    margin-top: 10px;
  }
  
  .board {
    position: relative;
    float: left;
    width: 428px;
    height: 428px;
    margin-top: 68px;
    background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/77020/board.png");
    box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.4);
  }
  
  .lit-columns,
  .lit-cells,
  .chips,
  .click-columns {
    position: absolute;
    width: 428px;
    height: 428px;
  }
  
  .lit-columns div {
    float: left;
    width: 60px;
    height: 426px;
    margin: 1px 0 1px 1px;
    transition: background-color 0.1s;
  }
  
  .lit-columns .lit {
    background-color: rgba(255, 255, 255, 0.1);
    transition: background-color 0.1s;
  }
  
  .lit-cells div {
    position: absolute;
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.3);
  }
  
  .chips div {
    position: absolute;
    width: 60px;
    height: 60px;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }
  
  .chips .p1 {
    background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/77020/p1-chip.png");
  }
  
  .chips .p2 {
    background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/77020/p2-chip.png");
  }
  
  .chips .cursor {
    bottom: 428px;
    transition: left 0.1s ease-out;
  }
  
  .chips .dropped {
    transition: bottom ease-in;
    animation: bounce 0.3s;
  }
  
  .click-columns div {
    float: left;
    width: 61px;
    height: 428px;
  }
  
  .click-columns div:first-child {
    padding-left: 1px;
  }
  
  .click-columns .hover {
    cursor: pointer;
  }
  
  @keyframes bounce {
    0% {
      animation-timing-function: ease-out;
      transform: translateY(0);
    }
    30% {
      animation-timing-function: ease-in;
      transform: translateY(-40px);
    }
    60% {
      animation-timing-function: ease-out;
      transform: translateY(0);
    }
    80% {
      animation-timing-function: ease-in;
      transform: translateY(-10px);
    }
    100% {
      animation-timing-function: ease-out;
      transform: translateY(0);
    }
  }