Ghost/ghost/admin/app/components/gh-browser-preview.hbs

{{!-- changes only classes between desktop/mobile to avoid re-rendering yielded contents --}}
<div class="{{if @isMobilePreview "gh-pe-mobile-container flex justify-center" "gh-browserpreview-previewcontainer"}}" ...attributes>
    {{#unless @isMobilePreview}}
        <div class="gh-browserpreview-browser">
            <div class="tabs">
                <ul><li></li><li></li><li></li></ul>
                <div>
                    {{#if (or @icon this.settings.icon)}}
                        <span class="favicon"><img src={{or @icon this.settings.icon}} alt="icon"></span>
                    {{else}}
                        <span class="favicon default">{{svg-jar "default-favicon"}}</span>
                    {{/if}}
                    <span class="site-title">{{or @title this.settings.title}}</span>
                </div>
            </div>
        </div>
    {{/unless}}
    <div class="{{if @isMobilePreview "gh-pe-mobile-bezel" "gh-browserpreview-iframecontainer"}}">
        <div class="{{if @isMobilePreview "gh-pe-mobile-screen"}}">
            {{yield}}
        </div>
    </div>
</div>