chromium/chrome/browser/resources/chromeos/emoji_picker/text_group_button.html

<style>
    #group-button {
      --hover-bg-color: var(--cr-hover-background-color);
      border: none;
      border-radius: 0;
      color: var(--emoji-picker-tab-unselected-color);
      font-size: 12px;
      font: var(--cros-button-1-font);
      margin: 0;
      margin-inline: var(--tab-button-margin);
      min-width: unset;
      width: max-content;
      --cr-button-height: var(--emoji-picker-group-button-height, 32px);
      padding-left: var(--emoji-picker-group-button-padding, 0px);
      padding-right: var(--emoji-picker-group-button-padding, 0px);
      border-radius: var(--emoji-picker-group-button-border-radius, 0px);
    }

    #group-button:hover {
      box-shadow: none;
    }

    #group-button:active {
      box-shadow: none;
    }

    #group-button.text-group-active {
      --cr-icon-button-fill-color: var(--emoji-picker-tab-selected-color);
      color: var(--emoji-picker-tab-selected-color);
    }

    cr-button {
      --focus-shadow-color: var(--emoji-picker-focus-ring-color);
    }
  </style>

<cr-button
    id="group-button"
    class$="[[calculateClassName(active)]]"
    on-click="handleClick"
    custom-tab-index="[[customTabIndex]]"
    aria-pressed$="[[getAriaPressedState(active)]]">
  [[name]]
</cr-button>