‘Sparkling’ is a clean, modern, flat design theme developed using Bootstrap 3. The frontend framework optimizes this theme for smartphones, tablets, desktops and. ‘Sparkling’ is a clean, modern, flat design theme developed using Bootstrap 3. The frontend framework optimizes this theme for smartphones, tablets, desktops and. WordPress. Child themes. If you’re looking to tweak colors, fonts, layout, backgrounds, spacing, and other visual elements, your best bet is to start by…