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<div class="app"><label class="t"><input type="checkbox"><span>☀</span><span>☾</span></label><h3>Hello there</h3><p>This card changes theme with no script.</p></div>About this layout
Theme Switch With :has() is a pure CSS layout made with HTML and CSS only, by @admin. Open an example, copy the HTML and the CSS, and paste them into your page. There is nothing to install and no JavaScript to load.