- play.csssecrets.io/inner-rounding — sqrt
- play.csssecrets.io/diamond-images — sqrt
- play.csssecrets.io/bevel-corners — sqrt
- play.csssecrets.io/folded-corner — sqrt
- play.csssecrets.io/folded-corner-realistic — sqrt, sin, cos
sqrt(2) == cos(45deg) * 2
sqrt(2) == cos(45deg) * 2