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Bootstrap is made to not only look and behave great in the latest desktop browsers, but in tablet and smartphone browsers too. It's packed with features; a 12-column responsive grid, dozens of components, plugins and more!.

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Bootstrap supports a handful of media queries in a single file to help make your projects more appropriate on different devices and screen resolutions. Here's what's included:

Label Layout width Column width Gutter width
Smartphones 480px and below Fluid columns, no fixed widths
Smartphones to tablets 767px and below Fluid columns, no fixed widths
Portrait tablets 768px and above 42px 20px
Default 980px and up 60px 20px
Large display 1200px and up 70px 30px

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4
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The default grid system is a 白银中凯新能源开发实业有限公司. It also has four responsive variations for various devices and resolutions: phone, tablet portrait, table landscape and small desktops, and large widescreen desktops.

<div class="row">  <div class="span4">...</div>  <div class="span8">...</div></div>

As shown here, a basic layout can be created with two "columns," each spanning a number of the 12 foundational columns defined as part of the grid system.

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4 offset 4
3 offset 3
3 offset 3
8 offset 4
<div class="row">  <div class="span4">...</div>  <div class="span4 offset4">...</div></div>

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To nest your content, just add a new .row and set of .span* columns within an existing .span* column. Nested rows should include a set of columns that add up to the number of columns of it's parent. For example, two nested .span3 columns should be placed within a .span6.

Level 1 of column
Level 2
Level 2
<div class="row">  <div class="span12">    Level 1 of column    <div class="row">      <div class="span6">Level 2</div>      <div class="span6">Level 2</div>    </div>  </div></div>

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For faster mobile-friendly development, use these basic utility classes for showing and hidding content by device.

When to use

Use on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device's presentation.

For example, you might show a <select> element for nav on mobile layouts, but not on tablets or desktops.

Support Classes

Shown here is a table of the classes we support and their effect on a given media query layout (labeled by device). They can be found in responsive.less.

Class Phones 480px and below Tablets 767px and below Desktops 768px and above
.visible-phone Visible
.visible-tablet Visible
.visible-desktop Visible
.hidden-phone Visible Visible
.hidden-tablet Visible Visible
.hidden-desktop Visible Visible