Without any doubt, Sparkle is great software. But I miss the following settings.
For a box and an image element, the settings for Border, Rounding and Shadow are always valid for all devices and cannot be set separately for each device.
I would wish if these settings could be set separately for each device.
With a 1200 pixel view, an image or a box with a 12-pixel frame and a rounding of 48 pixels looks very suitable. With a 320 pixel view on a smartphone, these settings seem much too high.
May my wish will be heard.