Center Bootstrap Contact Form - forms

Question

I'm setting up a contact form and I want this form to be centered on my page. But I don't want the full width (col-md-12) of the page. I only want the width of a col-md-6 at the center of the page. Problem is that because I select col-md-6, the form display on the left hand side of the page. How can I center it?
HTML:
<div class="container">
<div class="row">
<div class="col-md">
<form action="contact" method="post"> {{--action = where the data must go--}}
<div class="form-group">
<label for="name">Name:</label>
<input type="text" class="form-control" id="name" placeholder="Your Name">
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input type="email" class="form-control" id="email" placeholder="name#example.com">
</div>
<div class="form-group">
<label for="mobile">Mobile Nr:</label>
<input type="email" class="form-control" id="mobile" placeholder="Mobile Nr should start with 08, 07 or 06">
</div>
<div class="form-group">
<label for="message">Your message...</label>
<textarea class="form-control" id="message" rows="3"></textarea>
</div>
</form>
</div>
</div>
</div>

Answer 1

The easiest way I see is adding two more divisions with col-md-3 on either side of your form div like this:
<div class="container">
<div class="row">
<div class="col-md-3">
</div>
<div class="col-md-6">
<form action="contact" method="post"> {{--action = where the data must go--}}
<div class="form-group">
<label for="name">Name:</label>
<input type="text" class="form-control" id="name" placeholder="Your Name">
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input type="email" class="form-control" id="email" placeholder="name#example.com">
</div>
<div class="form-group">
<label for="mobile">Mobile Nr:</label>
<input type="email" class="form-control" id="mobile" placeholder="Mobile Nr should start with 08, 07 or 06">
</div>
<div class="form-group">
<label for="message">Your message...</label>
<textarea class="form-control" id="message" rows="3"></textarea>
</div>
</form>
</div>
<div class="cold-md-3">
</div>
</div>

Answer 2

Try adding "m-auto" class in your col-md-6 div. Like this:
<div class="container">
<div class="row">
<div class="col-md-6 m-auto">
<form action="contact" method="post"> {{--action = where the data must go--}}
<div class="form-group">
<label for="name">Name:</label>
<input type="text" class="form-control" id="name" placeholder="Your Name">
</div>
<div class="form-group">
<label for="email">Email address:</label>
<input t`enter code here`ype="email" class="form-control" id="email" placeholder="name#example.com">
</div>
<div class="form-group">
<label for="mobile">Mobile Nr:</label>
<input type="email" class="form-control" id="mobile" placeholder="Mobile Nr should start with 08, 07 or 06">
</div>
<div class="form-group">
<label for="message">Your message...</label>
<textarea class="form-control" id="message" rows="3"></textarea>
</div>
</form>
</div>
</div>