select2/src/scss/_single.scss

.select2-container {
  .selection .single-select {
    box-sizing: border-box;

    cursor: pointer;
    display: block;

    height: 28px;

    user-select: none;
    -webkit-user-select: none;

    .rendered-selection {
      display: block;
      overflow: hidden;
      padding-left: 8px;
      text-overflow: ellipsis;
    }
  }
}