使用 bootstrap 4.3.1 时如何将卡片列放在页面中心？

Question

I am trying to horizontally-center acard-columns withBootstrap 4.3.1 while nesting cards.

Here is how my cards are nested

 > Main Card
   >> Card-columns
      >>> Card 1  
      >>> Card 2     
      >>> Card 3 
      >>> Card N

I tried to place mx-auto class on the main-card and on the card-columns but that did not place the card-columns to the center of the page.

Here is my 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"> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script> <main role="main"> <div class="container-fluid"> <div class="mx-auto card bg-light"> <div class="card-body"> <h2 class="card-title text-center text-uppercase text-info">Cards</h2> <hr /> <div class="card-columns mx-auto"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 1</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 2</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> </div> </div> </div> </main>

I created a fiddler to demo what I have done so far.

How can I correctly place the card-column in the center of the screen?

Answer 1

You need to set your container div as a flex-box and then you can apply the bootstrap classes you need.

In this case, you want:
<div class="card-columns mx-auto d-flex justify-content-center col-12">

So because you want to center your card-columns , it's clear that justify-content-center does the job. For your card-columns width, you can play with the class col from bootstrap . Basically, it offers a maximum grid of 12 columns and that would take the whole page's view. And now you can then tell each card how many col-span you need them to take by adding col-[0 to 12] to up to a maximum of 12 because you have set their parent tag col-12 .

If it had col-8 instead, your cards could only take up to a maximum of 8 columns.

 <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"> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script> <main role="main"> <div class="container-fluid"> <div class="mx-auto card bg-light"> <div class="card-body"> <h2 class="card-title text-center text-uppercase text-info">Cards</h2> <hr /> <div class="card-columns mx-auto d-flex justify-content-center col-12"> <div class="card text-center col-4"> <div class="card-body"> <h5 class="card-title">Card 1</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> <div class="card text-center col-4"> <div class="card-body"> <h5 class="card-title">Card 2</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> </div> </div> </div> </main>

Answer 2

card-colums remove the flexbox of your nested cards. It become inline-block instead and you must align your card with other tricks.

https://getbootstrap.com/docs/4.3/components/card/#card-columns

What you can do is using card-deck and at this point you can put an mx-5 instead of auto. This way each cards will take 50% of the remaining width. The mx-auto won't work in this case because the cards will take the full width, splitting it in two, the the mx-auto will look for the remaining width and apply a margin on each side. In this case, the cards will take 50% each, so no space left for the mx-auto .

The mx-5 or anything from 0 to 5 is apply before the nested element get their respective width.

You can also use card-deck align-items-center and define the width of each cars.

Finally , the problem is you are trying to use inline-block and flex together, but you need to make a choice.

Answer 3

I could not get it done with using card-columns but I got it close using card with fixed with

Here is a jsFiddle with an updated code https://jsfiddle.net/dLbnvatm/

 <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"> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script> <main role="main"> <div class="container-fluid"> <div class="mx-auto card bg-light"> <div class="card-body"> <h2 class="card-title text-center text-uppercase text-info">Cards</h2> <hr /> <div class="mx-auto d-flex justify-content-center row"> <div class="col-sm-6 col-md-4 col-xl-3 p-1 m-0"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 1</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> <div class="col-sm-6 col-md-4 col-xl-3 p-1 m-0"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 2</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> <div class="col-sm-6 col-md-4 col-xl-3 p-1 m-0"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 3</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> <div class="col-sm-6 col-md-4 col-xl-3 p-1 m-0"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 4</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> <div class="col-sm-6 col-md-4 col-xl-3 p-1 m-0"> <div class="card text-center"> <div class="card-body"> <h5 class="card-title">Card 5</h5> <p class="card-text">This card has a regular title and short paragraphy of text below it.</p> <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p> </div> </div> </div> </div> </div> </div> </div> </main>