.bubble {
  position: relative;
  padding: 30px;
  position: relative;
  margin-bottom: -0.5rem;
  border-radius: 1rem;
  margin-left:-10px;
  margin-right:-10px;
}

.bubble::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 7px dotted #1d398c;
}
.bubble:nth-child(2n+1)::before {
  right: 93%;
  border-top-left-radius: 40rem;
  border-bottom-left-radius:20rem;
  border-right: none;
}
.bubble:nth-child(2n)::before {
  left: 7%;
  border-top-right-radius: 15rem;
  border-bottom-right-radius: 20rem;
  border-left: none;
}