1[popover] {
2  position-anchor: --anchor;
3  bottom: anchor(top);
4  left: anchor(center);
5}
6[popover] .arc {
7  position: absolute;
8  height: calc(var(--height, 150) * 1vh);
9  width: calc(var(--width, 120) * 1vw);
10  border-radius: calc(var(--radius) * 1%);
11}
12[popover]:popover-open .arc li {
13  offset-distance: calc(-24% + (var(--index) * 80px));
14  offset-path: xywh(0 0 100% 100% round 50%);
15  offset-anchor: 50% 0;
16  transition: offset-distance 0.875s var(--spring-ease);
17  @starting-style {
18    offset-distance: -24%;
19  }
20}