offset-path animation

@grid: 200x1 / 480px ^.8;
@size: @r(.5%, 1.5%);
border-radius: 50%;
position: absolute;
background: @p(#93ffe4, #84ff92);
offset-path: @shape(heart);
offset-distance: @t(
  /@r(400%, 800%),
  +@iI(*100%),
  +@r(100%)
);