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12

The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.

<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 we defined as part of our grid system.

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

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With the static (non-fluid) grid system in Bootstrap, nesting is easy. To nest your content, just add a new .row and set of .span* columns within an existing .span* column.

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Level 1 of column
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Level 2
<div class="row">
  <div class="span6">
    Level 1 column
    <div class="row">
      <div class="span3">Level 2</div>
      <div class="span3">Level 2</div>
    </div>
  </div>
</div>

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阻燃电缆的现状及发展

The fluid grid system uses percents for column widths instead of fixed pixels. It also has the same responsive variations as our fixed grid system, ensuring proper proportions for key screen resolutions and devices.

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

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Nesting with fluid grids is a bit different: the number of nested columns doesn't need to match the parent. Instead, your columns are reset at each level because each row takes up 100% of the parent column.

Fluid 12
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<div class="row-fluid">
  <div class="span12">
    Level 1 of column
    <div class="row-fluid">
      <div class="span6">Level 2</div>
      <div class="span6">Level 2</div>
    </div>
  </div>
</div>
VariableDefault valueDescription
@gridColumns12Number of columns
@gridColumnWidth60pxWidth of each column
@gridGutterWidth20pxNegative space between columns

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Built into Bootstrap are a handful of variables for customizing the default 940px grid system, documented above. All variables for the grid are stored in variables.less.

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Modifying the grid means changing the three @grid* variables and recompiling Bootstrap. Change the grid variables in variables.less and use one of the 多联智能电热套ZNHW-DL2/4/6. If you're adding more columns, be sure to add the CSS for those in grid.less.

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<body>
  <div class="container">
    ...
  </div>
</body>

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<div class="container-fluid"> gives flexible page structure, min- and max-widths, and a left-hand sidebar. It's great for apps and docs.

<div class="container-fluid">
  <div class="row-fluid">
    <div class="span2">
      <!--Sidebar content-->
    </div>
    <div class="span10">
      <!--Body content-->
    </div>
  </div>
</div>

Responsive devices

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LabelLayout widthColumn widthGutter width
Smartphones480px and belowFluid columns, no fixed widths
Smartphones to tablets767px and belowFluid columns, no fixed widths
Portrait tablets768px and above42px20px
Default980px and up60px20px
Large display1200px and up70px30px

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<meta name="viewport" content="width=device-width, initial-scale=1.0">

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Bootstrap doesn't automatically include these media queries, but understanding and adding them is very easy and requires minimal setup. You have a few options for including the responsive features of Bootstrap:

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Why not just include it? Truth be told, not everything needs to be responsive. Instead of encouraging developers to remove this feature, we figure it best to enable it.

  /* Landscape phones and down */
  @media (max-width: 480px) { ... }

  /* Landscape phone to portrait tablet */
  @media (max-width: 767px) { ... }

  /* Portrait tablet to landscape and desktop */
  @media (min-width: 768px) and (max-width: 979px) { ... }

  /* Large desktop */
  @media (min-width: 1200px) { ... }

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What are they

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

When to use

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ClassPhones 480px and belowTablets 767px and belowDesktops 768px and above
.visible-phoneVisible
.visible-tabletVisible
.visible-desktopVisible
.hidden-phoneVisibleVisible
.hidden-tabletVisibleVisible
.hidden-desktopVisibleVisible

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