<!-- Header -->
  <h1>Enter The Pin</h1>

  <!-- Form -->
  <form id="form">
    <!-- Inputs -->
    <input type="text" maxlength="1" class="input" />
    <input type="text" maxlength="1" class="input" />
    <input type="text" maxlength="1" class="input" />
    <input type="text" maxlength="1" class="input" />
    <input type="text" maxlength="1" class="input" />
    <input type="text" maxlength="1" class="input" />
  </form>

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  font-family: Arial, Helvetica, sans-serif;
  overflow: hidden;
  color: white;
  height: 100vh;
  background-color: hsl(218, 17%, 9%);
  background-color: #afb8c8;
}


/* Container holding all elements, allowing scrolling if needed */
#container {
  width: 100%;
  overflow: auto;
}

/* Form container */
#form {
  display: flex;
}

/* Input field */
.input {
  width: 45px;
  padding: 7px;
  text-align: center;
  font-size: 2rem;
  outline: 0;
  margin: 0 5px;
  border-radius: 5px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background-color: rgba(255, 255, 255, 0.5);
}

// inputs
const inputs = document.querySelectorAll('.input');

// Loop through inputs
inputs.forEach((input, index) => {
  // input field list
  input.addEventListener('input', (e) => {
    e.target.value = e.target.value.replace(/[^0-9]/g, ''); // Allow only numbers

    if (e.target.value && index < inputs.length - 1) {
      inputs[index + 1].focus(); // Move to next input
    }
  });
  // Move to previous input on backspace
  input.addEventListener('keydown', (e) => {
    if (e.key === 'Backspace' && index > 0 && !e.target.value) {
      inputs[index - 1].focus(); // Move to previous input on backspace
    }
  });
});