Avaliação com emoji

1<div class="av"><label><input type="radio" name="av" /><span>😞</span></label><label><input type="radio" name="av" /><span>😐</span></label><label><input type="radio" name="av" checked /><span>🙂</span></label><label><input type="radio" name="av" /><span>😍</span></label></div>