.primary-column { min-width: 0; }

.domain-input {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 120px;
}

.domain-input input { border-radius: 5px 0 0 5px; }
.domain-input select {
  border-left: 0;
  border-radius: 0 5px 5px 0;
  font-weight: 700;
}