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I am not sure which one.
.bpw-layout {
  width: 360px !important;
  height: 60vh;
  border-radius: 10px;
  right: 10px;
  bottom: 5px;
  border: 1px;
}

Could be this one since its on the mobile.
@media screen and (max-device-width: 767px) {
  .bpw-layout {
    width: 100% !important;
    height: 100%;
    right: 0;
    bottom: 0;
    border-radius: 0;
  }
}


Could be this
.bpw-chat-container {
  background-color: #ffffff;
  scrollbar-width: thin;
  scrollbar-color: #f5f5f5 #ffffff;
  border: none;
}