Transparent Background

[benjaminprojas]

When trying to use transparently, most of these loaders do not work well. Any chance they could be tweaked to work in a transparent environment?

[lukehaas]

Only two of the loaders require a solid background colour, loaders 2 and 3. There is really no way of avoiding this at the moment.
Ideally loader 3 could be achieved using border gradients but unfortunately border gradients can't be combined with border-radius.
Another alternative that would be nice to have is to use CSS masking to create an exclusion but that currently only works with images.

[chrisnicola]

You could try not setting the color in the box shadow property. It will default to the color of the element instead making it more flexible.