Bootstrap Center Vertical and Horizontal Alignment

I have a page where only form exists and I want form to be placed in the center of the screen.

<div class="container">
  <div class="row justify-content-center align-items-center">
    <form>
      <div class="form-group">
        <label for="formGroupExampleInput">Example label</label>
        <input type="text" class="form-control" id="formGroupExampleInput" placeholder="Example input">
      </div>
      <div class="form-group">
        <label for="formGroupExampleInput2">Another label</label>
        <input type="text" class="form-control" id="formGroupExampleInput2" placeholder="Another input">
      </div>
    </form>   
  </div>  
</div>

The justify-content-center aligns the form horizontally, but I can't figure out how to align it vertically. I have tried to use align-items-center and align-self-center, but it doesn't work.

What am I missing?

DEMO

Bootstrap 5 (Updated 2021)

Bootstrap 5 is still flexbox based so vertical centering works the same way as it did in Bootstrap 4. For example, align-items-center (flex-direction: row) and justify-content-center (flex-direction: column) can used on the flexbox parent (row or d-flex).

Centering examples in Bootstrap 5

Vertical center (don't forget the parent must have a defined height!):

• my-auto for centering inside flex (.d-flex) elements
• my-auto can be used to center columns (.col-) inside row
• align-items-center to center columns (col-*) inside row

Horizontal center:

• text-center to center display:inline elements & column content
• mx-auto for centering inside flex elements
• mx-auto can be used to center columns (.col-) inside row
• justify-content-center to center columns (col-*) inside row

---

Bootstrap 4.3+ (Update 2019)

There's no need for extra CSS. What's already included in Bootstrap will work. Make sure the container(s) of the form are full height. Bootstrap 4 now has a h-100 class for 100% height...

Vertical center:

<div class="container h-100">
  <div class="row h-100 justify-content-center align-items-center">
    <form class="col-12">
      <div class="form-group">
        <label for="formGroupExampleInput">Example label</label>
        <input type="text" class="form-control" id="formGroupExampleInput" placeholder="Example input">
      </div>
      <div class="form-group">
        <label for="formGroupExampleInput2">Another label</label>
        <input type="text" class="form-control" id="formGroupExampleInput2" placeholder="Another input">
      </div>
    </form>   
  </div>
</div>

https://codeply.com/go/raCutAGHre

the height of the container with the item(s) to center should be 100% (or whatever the desired height is relative to the centered item)

Note: When using height:100% (percentage height) on any element, the element takes in the height of it's container. In modern browsers vh units height:100vh; can be used instead of % to get the desired height.

Therefore, you can set html, body {height: 100%}, or use the new min-vh-100 class on container instead of h-100.

---

Horizontal center:

• text-center to center display:inline elements & column content
• mx-auto for centering inside flex elements
• offset-* or mx-auto can be used to center columns (.col-)
• justify-content-center to center columns (col-*) inside row

---

https://stackoverflow.com/questions/42252443/vertical-align-center-in-bootstrap-4/42252877#42252877<br> Bootstrap 4 full-screen centered form
Bootstrap 4 center input group
Bootstrap 4 horizontal + vertical center full screen

This work for me:

<section class="h-100">
  <header class="container h-100">
    <div class="d-flex align-items-center justify-content-center h-100">
      <div class="d-flex flex-column">
        <h1 class="text align-self-center p-2">item 1</h1>
        <h4 class="text align-self-center p-2">item 2</h4>
        <button class="btn btn-danger align-self-center p-2" type="button" name="button">item 3</button>
      </div>
    </div>
  </header>
</section>

flexbox can help you. info here

<div class="d-flex flex-row justify-content-center align-items-center" style="height: 100px;">
    <div class="p-2">
     1
    </div>
    <div class="p-2">
     2
    </div>
</div>

Bootstrap has text-center to center a text. For example

<div class="container text-center">

You change the following

<div class="row justify-content-center align-items-center">

to the following

<div class="row text-center">

You need something to center your form into. But because you didn't specify a height for your html and body, it would just wrap content - and not the viewport. In other words, there was no room where to center the item in.

html, body {
  height: 100%;
}
.container, .row.justify-content-center.align-items-center {
  height: 100%;
  min-height: 100%;
}

None has worked for me. But his one did.

Since the Bootstrap 4 .row class is now display:flex you can simply use the new align-self-center flexbox utility on any column to vertically center it:

<div class="row">
   <div class="col-6 align-self-center">
      <div class="card card-block">
      Center
      </div>
   </div>
   <div class="col-6">
      <div class="card card-inverse card-danger">
      Taller
      </div>
   </div>
</div>

I learned about it from https://medium.com/wdstack/bootstrap-4-vertical-center-1211448a2eff

This is working in IE 11 with Bootstrap 4.3. While the other answers were not working in IE11 in my case.

 <div class="row mx-auto justify-content-center align-items-center flex-column ">
    <div class="col-6">Something </div>
</div>

https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet"/>

been going thru a lot of posts on getting a form centered in the page and none of them worked. code below is from a react component using bootstrap 4.1. height should be 100vh and not 100%

<div className="container">
      <div className="d-flex justify-content-center align-items-center" style={height}>
        <form>
          <div className="form-group">
            <input className="form-control form-control-lg" placeholder="Email" type="email"/>
          </div>
          <div className="form-group">
            <input className="form-control form-control-lg" placeholder="Password" type="password"/>
          </div>
          <div className="form-group">
            <button className="btn btn-info btn-lg btn-block">Sign In</button>
          </div>
        </form>
      </div>
    </div>

> where height in style is:

const height = { height: '100vh' }

I am required to show form vertically center inside container-fluid so I developed my own code for the same.

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
    <style>
       .container-fluid
       {
            display: table-cell;
            height: 100vh;
            width: 100vw !important;
            vertical-align: middle;
            border:1px solid black;
       }
    </style>
</head>

<body>
    <div class="container-fluid">
        <div class="row">
            <div class="col-8 offset-2">
                <div class="card shadow">
                    <div class="card-header bg-danger text-white">
                        <h2>Login</h2>
                    </div>

                    <div class="card-body">
                        <form action="">
                            <div class="form-group row">
                                <label for="txtemail" class="col-form-label col-sm-2">Email</label>
                                <div class="col-sm-10">
                                    <input type="email" name="txtemail" id="txtemail" class="form-control" required />
                                </div>
                            </div>
                            <div class="form-group row">
                                <label for="txtpassword" class="col-form-label col-sm-2">Password</label>
                                <div class="col-sm-10">
                                    <input type="password" name="txtpassword" id="txtpassword" class="form-control"
                                        required />
                                </div>
                            </div>
                            <div class="form-group">
                                <button class="btn btn-danger btn-block">Login</button>
                                <button class="btn btn-warning btn-block">clear all</button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
        <script src="js/jquery.js"></script>
        <script src="js/popper.min.js"></script>
        <script src="js/bootstrap.min.js"></script>
</body>

</html>

From bootstrap v5.0 just:

<div class="position-absolute top-50 start-50 translate-middle">
   centred
</div>

Try the code given below while using v4 or v5.

<div class="d-flex align-items-center justify-content-center" style="height:100vh;">
  Vertically and Horizontally Aligned :)
</div>

...OR... You can use these classes if using v5.

<div class="position-absolute top-50 start-50 translate-middle">
  Vertically and Horizontally Aligned :)
</div>

Do this, and that's it :)

Use This Code In CSS :

.container {
    width: 600px;
    height: 350px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: inline-flex;
}

I ended up here because I was having an issue with Bootstrap 4 grid system and an Angular *ngFor loop. I fixed it by applying a col justify-content-center class to the div implementing the ngFor:

<div class="row" style="border:1px solid red;">
  <div class="col d-flex justify-content-center">
    <button mat-raised-button>text</button>
  </div>
  <div *ngFor="let text of buttonText" class="col d-flex justify-content-center">
    <button mat-raised-button>text</button>
  </div>
</div>

which gives the result:

From the doc (bootsrap 4):

https://getbootstrap.com/docs/4.0/utilities/flex/#justify-content

.justify-content-start
.justify-content-end
.justify-content-center
.justify-content-between
.justify-content-around
.justify-content-sm-start
.justify-content-sm-end
.justify-content-sm-center
.justify-content-sm-between
.justify-content-sm-around
.justify-content-md-start
.justify-content-md-end
.justify-content-md-center
.justify-content-md-between
.justify-content-md-around
.justify-content-lg-start
.justify-content-lg-end
.justify-content-lg-center
.justify-content-lg-between
.justify-content-lg-around
.justify-content-xl-start
.justify-content-xl-end
.justify-content-xl-center
.justify-content-xl-between
.justify-content-xl-around

bootstrap 5

body {
  display: flex;
  align-items: center;
}

https://getbootstrap.com/docs/5.1/examples/sign-in/

Bootstrap way

> HTML

 <div class="row top-row">
        <div class="col center-text">
            <H1>Center Text Horizantally and vertically</H1>
        </div>
</div>

> Custom CSS

  .top-row{
        height: 300px; //It's important to set height 
    }
  .center-text{
       display: flex;
       align-items: center;
       justify-content: center;
    }