#missed-call-banner {
  position: fixed;
  bottom: 20px;
  right: 20px;
  left: auto;
  z-index: 2000;
  max-width: 840px;
  width: min(840px, calc(100% - 2rem));
  padding: 0.65rem 1rem;
  border-radius: 0.75rem;
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}
#missed-call-banner .btn {
  white-space: nowrap;
}