chess-io/src/css/_chessboard.scss

#board-moves-wrapper {
  width: 100%;
  max-width: 800px;
  min-height: 600px;
  margin: 0 auto;
}

#moves {
  overflow-x: hidden;
  overflow-y: auto;
  width: 270px;
  height: 518px;
  background: lighten($grey, 5%);
  box-shadow: inset 0 -4px $grey;
  margin-left: 10px;
  border-radius: 2px;
  border-bottom: 4px solid $grey;
  display: block;
  float: left; 

  thead {
    font-family: 'Cherry Swash', cursive;
    width: 270px;
    height: 3em;
    line-height: 3em;
    font-size: 1.225rem;
    color: $dark-purple;
    float: left;
    text-align: center;

    th, tr {
      width: 100%;
      text-align: center;
      float: left;
    }
  }

  tbody tr {
    width: 270px;
    float: left;
  }

  tbody tr td {
    width: 85px;
    text-align: left;
    line-height: 20px;
    margin: 0 10px;
    float: left;

    &:first-child {
      width: 40px;
      margin-right: 0;
    }
  }
}

#board-wrapper {
  float: left;
}

.chessboard {
  border: 8px solid lighten($dark-purple, 10%);
  border-radius: 2px;
  width: 500px;
  height: 500px;
  float: left;
  
  tr {
    width: 500px;
    height: 62.5px;
    float: left;
    display: block;

    td {
      width: 62.5px;
      height: 62.5px;
      line-height: 62.5px;
      text-align: center;
      background: #fefefe;
      display: block;
      float: left;
      position: relative;

      &.moving, &.selected { background: lighten($red, 30%) !important; }
      &.from { background: lighten($blue, 25%) !important; }
      &.to { background: lighten($blue, 20%) !important; }
      &.droppable::after {
        position: absolute;
        content: "";
        width: 6px;
        height: 6px;
        border: 2px solid $red;
        top: 50%;
        left: 50%;
        margin-left: -5px;
        margin-top: -5px;
        background: lighten($red, 15%);
        transform: rotate(45deg);
      }

      a {
        font-family: 'Smart Regular';
        width: 62.5px;
        height: 62.5px;
        font-size: 3.5rem;
        color: #424242;
        text-decoration: none;
        display: inline-block;
        cursor: default;

        &.in-check { text-shadow: 0 0 1rem $red; }
        &[draggable="true"] { cursor: pointer; }
      }
    }
  }
}

.chessboard tr:nth-child(odd) td:nth-child(even), 
.chessboard tr:nth-child(even) td:nth-child(odd) { 
  background: $grey;
}

.feedback {
  color: #424242;
  line-height: 28px;
  margin-top: 1em;
  display: block;
  clear: left;
  float: left;

  .icon {
    font-family: 'Smart Regular';
    font-size: 2rem;
  }
}

.promotion {
  line-height: 28px;
  text-indent: 28px;
  margin-top: 1em;
  display: block;
  float: right;
}