Html: Bootstrap form alignment in center - html

Question

I'm currently working on a simple login system and I have some Front-End difficulties. I'm trying to make a center-based login form with some inputs and a button. So basically right now I was able to make few inputs inside the center, but when I tried adding a button, then I got result like this:
Note: I need the button to be in the center of the form. Also, am I doing the form in the center correctly?
My HTML code:
<div class="container">
<h1 class="page-header text-center apie_m_cga">~ Support Desk ~</h1>
<hr>
<div class="row justify-content-center">
<div class="form-group col-md-3 col-md-offset-7 align-center ">
<br>
<input type="text" id="inputUsername6" placeholder="Username" class="form-control mx-sm-3 text-center">
<br>
<input type="password" id="inputPassword6" placeholder="Password" class="form-control mx-sm-3 text-center">
<br>
<button type="button" class="btn btn-primary btn-lg">Login</button>
</div>
</div>
<br>
</div>

Answer 1

add text-center class to the div that contain form-group class:
<div class="container">
<h1 class="page-header text-center apie_m_cga">~ Support Desk ~</h1>
<hr>
<div class="row justify-content-center ">
<div class="form-group col-md-3 col-md-offset-7 align-center text-center">
<br>
<input type="text" id="inputUsername6" placeholder="Username" class="form-control mx-sm-3 text-center">
<br>
<input type="password" id="inputPassword6" placeholder="Password" class="form-control mx-sm-3 text-center">
<br>
<button type="button" class="btn btn-primary btn-lg">Login</button>
</div>
</div>
<br>
</div>

Answer 2

Just add a text-align: center; to your form-group
.form-group {
text-align: -webkit-center;
text-align: center;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="container">
<h1 class="page-header text-center apie_m_cga">~ Support Desk ~</h1>
<hr>
<div class="row justify-content-center">
<div class="form-group col-md-3 col-md-offset-7">
<br>
<input type="text" id="inputUsername6" placeholder="Username" class="form-control mx-sm-3 text-center">
<br>
<input type="password" id="inputPassword6" placeholder="Password" class="form-control mx-sm-3 text-center">
<br>
<button type="button" class="btn btn-primary btn-lg">Login</button>
</div>
</div>
<br>
</div>

Answer 3

You just need to add .text-center add on parent DIV
<div class="container">
<h1 class="page-header text-center apie_m_cga">~ Support Desk ~</h1>
<hr>
<div class="row justify-content-center">
<div class="form-group col-md-3 col-md-offset-7 align-center text-center">
<br>
<input type="text" id="inputUsername6" placeholder="Username" class="form-control mx-sm-3 text-center">
<br>
<input type="password" id="inputPassword6" placeholder="Password" class="form-control mx-sm-3 text-center">
<br>
<button type="button" class=" btn-primary btn-lg">Login</button>
</div>
</div>
<br>
</div>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>

Answer 4

I'll suggest you make the button the same length with the input fields, it'll make the form look better.
Try this:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<div class="container">
<h1 class="page-header text-center apie_m_cga">~ Support Desk ~</h1>
<hr>
<div class="row justify-content-center">
<div class="form-group col-md-3 col-md-offset-7 align-center ">
<br>
<input type="text" id="inputUsername6" placeholder="Username" class="form-control text-center">
<br>
<input type="password" id="inputPassword6" placeholder="Password" class="form-control col-12 text-center">
<br>
<button type="button" class="btn col-12 btn-primary">Login</button>
</div>
</div>
<br>
</div>

Answer 5

I think the class of your button "btn-lg" is influenced in position. Basically there is no any special errors on your script except for it.
Please remove it in class and try again