Add a nice Wavy edge to your element or create Wavy lines using CSS mask.
.box {
--mask:
radial-gradient(34.99px at 50% calc(100% - 48px),#000 99%,#0000 101%) calc(50% - 60px) 0/120px 100%,
radial-gradient(34.99px at 50% calc(100% + 18px),#0000 99%,#000 101%) 50% calc(100% - 30px)/120px 100% repeat-x;
-webkit-mask: var(--mask);
mask: var(--mask);
}