css - Twitter's Bootstrap 3 grid, changing breakpoint and removing padding

Question

I m trying to move to the new boostrap 3 grid and I m facing some difficulties.

1. How to have the grid to stack below 480px but not between 480px and 768px?
2. above 768px the padding left of the first and the padding right of the last are outside the container, but below 768px the padding is inside the container so the look is different because the content is no more aligned with a container that could be above.
3. when the grid stack the padding remain but to me it should be at 0.

Any help would be welcome I m using the code below with bootstrap 3 RC1

    <div class="container" style="background-color: purple;">
container

</div>

<div class="container">
    <div class="row">
        <div style="background-color: red" class="col-4 col-sm-4 col-lg-4"><img data-src="holder.js/100%x200"></div>
        <div style="background-color: blue" class="col-4 col-sm-4 col-lg-4"><img data-src="holder.js/100%x200"></div>
        <div style="background-color: green" class="col-4 col-sm-4 col-lg-4"><img data-src="holder.js/100%x200"></div>
    </div>
</div>

Answer 1

update jan 2014

See also: https://github.com/twbs/bootstrap/issues/10203

update 21 aug 2013 Since Twitter Bootstrap 3 RC2 the col-* mentioned below has been renamed to xs-col-* There are four grid classes now: xs-col-* (mobile, never stacks), col-sm-* (tablet, stacks below 768px), col-md-* (laptops,stacks below 992 px) and col-lg-* (desktop, stacks below 1200px).

update In my previous answer i use this table from the recent docs:

[old image removed]

When i test this values if found something different:

• "col-xs-*" will be applied always (never stacks)
• "col-sm-*" will be applied between 768 and higher (992px) (stacks at 767)
• "col-lg-*" will be applied between 992 and higher (stacks at 991)

In variables.less you will find:

// Media queries breakpoints
// --------------------------------------------------

// Tiny screen / phone
@screen-tiny:                480px;
@screen-phone:               @screen-tiny;

// Small screen / tablet
@screen-small:               768px;
@screen-tablet:              @screen-small;

// Medium screen / desktop
@screen-medium:              992px;
@screen-desktop:             @screen-medium;

But there doesn't seem to be a breakpoint at 480px (or as @fred_ says the grid is missing the col-ts-* (tiny to small) set of classes). See also: https://github.com/twbs/bootstrap/issues/9746

To set the stacking point at 480px you will have to recompile yours css. Set @screen-small to 480px; and define your cols with: <div style="background-color: red" class="col-sm-4"> after that. Note this will change @grid-float-breakpoint also cause it is defined as @grid-float-breakpoint: @screen-tablet;.

When adding a row to the container i don't find problems with padding.

Or try: http://www.bootply.com/70212 it will stack below 480px by adding a media query (the javascript is used for illustration only)

previous answer

From now Twitter’s Bootstrap defines three grids: Tiny grid for Phones (<480px), Small grid for Tablets (<768px) and the Medium-large grid for Destkops (>768px). The row class prefixes for these grid are “.col-”, “.col-sm-” and “.col-lg-”. The Medium-large grid will stack below 768 pixels screen width. So does the Small grid below 480 pixels and the tiny grid never stacks.

With your "col-4" prefix the grid will never stack. So remove "col-4" to let your grid stack below the 480px. This also will remove padding cause is stacks now.

See also: http://bassjobsen.weblogs.fm/migrate-your-templates-from-twitter-bootstrap-2-x-to-twitter-bootstrap-3/ and Writing Twitter's Bootstrap with upgrading to v3 in mind