oldhaven/app/assets/stylesheets/search.scss

#autocomplete-container {
  .inner {
    .start {
      height: 3px;
      padding: 0;
      background-color: #ffffff;
      border-bottom: none;
    }
    .content {
      padding: 0 0 3px 0;
      div {
        padding: 6px 10px;
        background-color: #ffffff;
        &.selected {
          color: #202020;
          background-color: #e0e0e0;
        }
      }
    }
  }
}