@kevincuadros/react-code/src/styles/InputValidator.css

> Pin input component for React

.input_item::-webkit-outer-spin-button,
.input_item::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.input_item {
  border: 2px solid #ccc;
  width: 30px;
  height: 45px;
  margin: 0 5px;
  -webkit-appearance: none;
  text-align: center;
  font-size: 1.5rem;
  outline: none;
  border-radius: 5px;
}

.input_item:focus {
  border: 2px solid rgb(5, 142, 255);
}

input::placeholder{
  color: #ccc;
}

input:focus::placeholder {
  color: transparent;
}