.ms-newsletter {
  display: flex;
  max-width: 480px;
  border: 1px solid #111;
  border-radius: 999px;
  padding: 0 8px 0 18px;
  overflow: hidden;
}

.ms-newsletter input {
  flex: 1;
  min-width: 0;
  border: 0;
  padding: 14px 0;
  background: transparent;
}

.ms-newsletter button {
  min-width: 76px;
  border: 0;
  background: transparent;
  font-weight: 800;
}