The right side of the image is the problem, I can t make the border a wave like it. I want it to curve but not symmetrically.
这是最接近的I got():
.box {
--mask:
radial-gradient(223.61px at calc(100% - 300.00px) 50%,#000 99%,#0000 101%) 0 calc(50% - 200px)/100% 400px,
radial-gradient(223.61px at calc(100% + 200.00px) 50%,#0000 99%,#000 101%) calc(100% - 100px) 50%/100% 400px repeat-y;
-webkit-mask: var(--mask);
mask: var(--mask);
}