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I have not encountered this before, and I am having a very hard time trying to find the solution. When having a column equal to medium in bootstrap like so:
<h1 class="text-center">Hello, world!</h1>
<div class="container">
<div class="row">
<div class="col-md-12 text-center">
<h1>vicki williams</h1>
</div>
</div>
</div>
The text-align works fine:
But when making the column equal to extra small like so:
<div class="container">
<div class="row">
<div class="col-xs-12 text-center">
<h1>vicki williams</h1>
</div>
</div>
</div>
Then the text-align no longer works:
Is there some bootstrap concept that I am not understanding or is this in fact a error like I think it is. I have never had this issue, as my text always has aligned in the past with xs. Any help would be greatly appreciated. Here is my complete code:
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
</head>
<body>
<h1 class="text-center">Hello, world!</h1>
<div class="container">
<div class="row">
<div class="col-xs-12 text-center">
<h1>vicki williams</h1>
</div>
</div>
</div>
<!-- jQuery first, then Tether, then Bootstrap JS. -->
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</body>
</html>
454
In short, they are used to define at which screen size that class should apply: xs = extra small screens (mobile phones) sm = small screens (tablets) md = medium screens (some desktops) lg = large screens (remaining desktops)
col-xs-1: This class is used when the device size is extra small (mobile) and when you want the width to be equal to 1 column. col-lg-2: This class is used when the device size is large or greater than 992px and the maximum width of container is 960px and when you want size equal to 2 columns.
Column classes indicate the number of columns you'd like to use out of the possible 12 per row. So, if you want three equal-width columns across, you can use .col-4 . Column width s are set in percentages, so they're always fluid and sized relative to their parent element.
Columns create gutters (gaps between column content) via padding. That padding is offset in rows for the first and last column via negative margin on .rows. Grid columns are created by specifying the number of 12 available columns you wish to span. For example, three equal columns would use three .col-sm-4.
col-xs-* have been dropped in Bootstrap 4 in favor of col-*.
Replace col-xs-12 with col-12 and it will work as expected.
Also note col-xs-offset-{n} were replaced by offset-{n} in v4.
179
I just wondered, why col-xs-6 did not work for me but then I found the answer in the Bootstrap 4 documentation. The class prefix for extra small devices is now col- while in the previous versions it was col-xs.
https://getbootstrap.com/docs/4.1/layout/grid/#grid-options
Bootstrap 4 dropped all col-xs-* classes, so use col-* instead. For example col-xs-6 replaced by col-6.
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