Ghost/ghost/admin/app/components/announcement-settings/background.hbs

<div class="gh-stack-item {{if (eq @index 0) "gh-setting-first" "gh-setting"}}">
    <div class="flex-grow-1">
        <div class="flex justify-between items-center relative">
            <label class="gh-setting-title" for="announcement-background">
                Background color
            </label>

            <div class="kg-settings-panel-control-input">
                <div class="gh-btn-group kg-settings-headerstyle-btn-group">
                    <button class="gh-btn kg-headerstyle-btn-dark gh-btn-group-selected" type="button"></button>
                    <button class="gh-btn kg-headerstyle-btn-light" type="button"></button>
                    <button class="gh-btn kg-headerstyle-btn-accent" type="button"></button>
                </div>
            </div>

            {{!-- <span class="gh-select">
                <select class="ember-select" name="announcement-background" id="announcement-background" {{on "change" this.setBackground}}>
                    {{#each this.options as |settingOption|}}
                        <option value={{settingOption.value}} selected={{eq settingOption.value this.background}}>
                            {{settingOption.label}}
                        </option>
                    {{/each}}
                </select>
                {{svg-jar "arrow-down-small"}}
            </span> --}}
        </div>
    </div>
</div>