src/scss/select2/theme/poncho/_multiple.scss
.select2-selection--multiple {
  background-color: white;
  border: 1px solid #aaa;
  border-radius: 4px;
  cursor: text;
  padding-bottom: 5px;
  padding-right: 5px;
  position: relative;

  &.select2-selection--clearable {
    padding-right: 25px;
  }

  .select2-selection__clear {
    cursor: pointer;
    font-weight: bold;
    height: 20px;
    margin-right: 10px;
    margin-top: 5px;

    position: absolute;
    right: 0;

    // This padding is to account for the bottom border for the first
    // selection row and the top border of the second selection row.
    // Without it, selections on the first row may be offset incorrectly
    // and appear in their own row instead of going to the second row
    padding: 1px;
  }

  .select2-selection__choice {
    background-color: #e4e4e4;
    border: 1px solid #aaa;
    border-radius: 4px;
    box-sizing: border-box;

    display: inline-block;
    margin-left: 5px;
    margin-top: 5px;
    padding: 0;
    padding-left: 20px;

    position: relative;

    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    vertical-align: bottom;
    white-space: nowrap;
  }

  .select2-selection__choice__display {
    cursor: default;

    padding-left: 2px;
    padding-right: 5px;
  }

  .select2-selection__choice__remove {
    background-color: transparent;
    border: none;
    border-right: 1px solid #aaa;
    border-top-left-radius: 4px;
    border-bottom-left-radius: 4px;

    color: #999;
    cursor: pointer;

    font-size: 1em;
    font-weight: bold;

    padding: 0 4px;

    position: absolute;
    left: 0;
    top: 0;

    &:hover, &:focus {
      background-color: #f1f1f1;
      color: #333;
      outline: none;
    }
  }
}

&[dir="rtl"] {
  .select2-selection--multiple {
    .select2-selection__choice {
      margin-left: 5px;
      margin-right: auto;
    }

    .select2-selection__choice__display {
      padding-left: 5px;
      padding-right: 2px;
    }

    .select2-selection__choice__remove {
      border-left: 1px solid #aaa;
      border-right: none;
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
      border-top-right-radius: 4px;
      border-bottom-right-radius: 4px;
    }

    .select2-selection__clear {
      float: left;
      margin-left: 10px;
      margin-right: auto;
    }
  }
}

&.select2-container--focus {
  .select2-selection--multiple {
    border: solid black 1px;
    outline: 0;
  }
}

&.select2-container--disabled {
  .select2-selection--multiple {
    background-color: #eee;
    cursor: default;
  }

  .select2-selection__choice__remove {
    display: none;
  }
}
