...
<h2>Create your account</h2>
...
<div class="input-group">
  <label>Confirm password</label>
  <input type="password" id="password2" required minlength="6">
</div>
...
<span>Already have an account? <a href="login.html">Login</a></span>
...
function handleSignup(e) {
  e.preventDefault();
  if (document.getElementById('password').value !== document.getElementById('password2').value) {
    alert("Passwords don't match"); return;
  }
  localStorage.setItem('token', 'fake-jwt');
  location.href = 'dashboard.html';
}