Align the form to the center in Bootstrap 4 [duplicate] - html

Question

This question already has answers here:
Bootstrap Center Vertical and Horizontal Alignment
(17 answers)
Closed 2 years ago.
I am trying to align the form to the center and keep it responsive. I have tried several ways but no success. I am trying to center all the text and the form. I am using Bootstrap v4. I am not sure if that helps.
HTML:
<section id="cover">
<div id="cover-caption">
<div id="container">
<div class="col-sm-10 col-sm offset-1">
<h1 class="display-3">Welcome to Bootstrap 4</h1>
<div class="info-form">
<form action="" class="form-inline">
<div class="form-group">
<label class="sr-only">Name</label>
<input type="text" class="form-control" placeholder="Jane Doe">
</div>
<div class="form-group">
<label class="sr-only">Email</label>
<input type="text" class="form-control" placeholder="jane.doe#example.com">
</div>
<button type="submit" class="btn btn-success ">okay, go!</button>
</form>
</div>
<br>
↓
</div>
</div>
</div>
</section>
CSS:
html,
body{
height: 100%;
}
#cover {
background: #222 url('../img/stars.jpg') center center no-repeat;
background-size: cover;
color: white;
height: 100%;
text-align: center;
display: flex;
align-items: center;
}
#cover-caption {
width: 100%;
}

Answer 1

You need to use the various Bootstrap 4 centering methods...
Use text-center for inline elements.
Use justify-content-center for flexbox elements (ie; form-inline)
https://codeply.com/go/Am5LvvjTxC
Also, to offset the column, the col-sm-* must be contained within a .row, and the .row must be in a container...
<section id="cover">
<div id="cover-caption">
<div id="container" class="container">
<div class="row">
<div class="col-sm-10 offset-sm-1 text-center">
<h1 class="display-3">Welcome to Bootstrap 4</h1>
<div class="info-form">
<form action="" class="form-inline justify-content-center">
<div class="form-group">
<label class="sr-only">Name</label>
<input type="text" class="form-control" placeholder="Jane Doe">
</div>
<div class="form-group">
<label class="sr-only">Email</label>
<input type="text" class="form-control" placeholder="jane.doe#example.com">
</div>
<button type="submit" class="btn btn-success ">okay, go!</button>
</form>
</div>
<br>
↓
</div>
</div>
</div>
</div>
</section>

Answer 2

<div class="d-flex justify-content-center align-items-center container ">
<div class="row ">
<form action="">
<div class="form-group">
<label for="inputUserName" class="control-label">Enter UserName</label>
<input type="email" class="form-control" id="inputUserName" aria-labelledby="emailnotification">
<small id="emailnotification" class="form-text text-muted">Enter Valid Email Id</small>
</div>
<div class="form-group">
<label for="inputPassword" class="control-label">Enter Password</label>
<input type="password" class="form-control" id="inputPassword" aria-labelledby="passwordnotification">
</div>
</form>
</div>
</div>

Answer 3

All above answers perfectly gives the solution to center the form using Bootstrap 4. However, if someone wants to use out of the box Bootstrap 4 css classes without help of any additional styles and also not wanting to use flex, we can do like this.
A sample form
HTML
<div class="container-fluid h-100 bg-light text-dark">
<div class="row justify-content-center align-items-center">
<h1>Form</h1>
</div>
<hr/>
<div class="row justify-content-center align-items-center h-100">
<div class="col col-sm-6 col-md-6 col-lg-4 col-xl-3">
<form action="">
<div class="form-group">
<select class="form-control">
<option>Option 1</option>
<option>Option 2</option>
</select>
</div>
<div class="form-group">
<input type="text" class="form-control" />
</div>
<div class="form-group text-center">
<div class="form-check-inline">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="optradio">Option 1
</label>
</div>
<div class="form-check-inline">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="optradio">Option 2
</label>
</div>
<div class="form-check-inline">
<label class="form-check-label">
<input type="radio" class="form-check-input" name="optradio" disabled>Option 3
</label>
</div>
</div>
<div class="form-group">
<div class="container">
<div class="row">
<div class="col"><button class="col-6 btn btn-secondary btn-sm float-left">Reset</button></div>
<div class="col"><button class="col-6 btn btn-primary btn-sm float-right">Submit</button></div>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
Link to CodePen
https://codepen.io/anjanasilva/pen/WgLaGZ
I hope this helps someone. Thank you.