iput/src/style.css

an IP input component like windows

.react-ip-input {
  display: inline-block;
  border: 1px solid #c2c3c9;
  border-radius: 4px;
  padding: 5px 8px;
}

.react-ip-input .react-ip-input__item {
  display: inline-block;
}

.react-ip-input.has-error {
  border-color: #a94442;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
}

.react-ip-input input {
  width: 30px;
  border: none;
  outline: none;
  text-align: center;
}