I'm building a website using PHP and MySQL without any CMS or Framework. I will do all the code. Here is the login form that I'm working on and I would like to change the style for popup message, that is "Please fill out this field". I'm using Chrome.
Here is the form code:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<form class="form-login" method="post">
<h3>Enter Your Credentials To Login</h3>
<div class="container-fluid">
<div class="form-row">
<div class="col-lg-4 mx-auto">
<div class="input-group mb-1">
<input autocomplete="off" type="email" name="user-email" class="form-control" placeholder="Enter Your Email Address" required autofocus="" />
</div>
<div class="input-group mb-1">
<input autocomplete="off" type="password" name="user-pass" class="form-control" placeholder="Enter Your Password" autofocus="">
</div>
<button class="btn btn-block" type="submit"><i class="fas fa-sign-in-alt"></i> Login</button>
</div>
</div>
</div>
</form>
I would like to know how to change the css for that popup like make the text, etc.
I did some research but I haven't found any final solution so far.
I'm talking about the popup when you click submit if the field is empty, not the input.
I have checked these posts and none of them helps.
How do I style the HTML5 form validation error messages with CSS?
All of the solutions above are obsolete, outdated, over 8 years ago.