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.
<div class="row">
<div class="span4">...</div>
<div class="span4 offset4">...</div>
</div>
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.
.span3 columns should be placed within a .span6.
<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>
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.
食材不统一，品质良莠不齐 同时，由于海鲜很难存储和运输，统一供应的成本太高，所以加盟商都是自行选择供应商，这就导致各地门店的食材和出品参差不齐。 第二口锅：有了情怀就可以创业 每次说到情怀创业，我最喜欢举例的不是某罗姓导师，而是曾经的手机巨头诺基亚。
<div class="row-fluid">
<div class="span4">...</div>
<div class="span8">...</div>
</div>
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.
<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>
The default and simple 940px-wide, centered layout for just about any website or page provided by a single <div class="container">.
<body>
<div class="container">
...
</div>
</body>
<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>
Media queries allow for custom CSS based on a number of conditions—ratios, widths, display type, etc—but usually focuses around min-width and max-width.
地球人都知道，景山学校都是首长的子弟就读，随便就可以建分校的吗?不过，杨国强却认了真，他真就跑到北京，又通过七拐八拐的关系，找到景山中学的校长“我可以出资百万在广东建个分校。 胡玮炜，摩拜创始人，从2014年底有了摩拜单车的想法到2015年初注册成立公司，两年时间里，她费了很多精力，找投资、自建工厂、自己组建研发团队，生产出一款智能共享单车。
事实上，头条号已经走在这条路上了，号外是个比较明显的例证，不明显的另一个事实是——假如你头条上的某篇文章突破了80万阅读，接下来1、2天内发的内容都会受到推荐限制，本人亲测多次，流量达到这个水平的自媒体人应该也不难发现这个“小秘密”。对于机器初审的平台来说，骗过机器模型就行，但对于人工+机器的平台，标题党和低质内容，又是如何猎取流量的? 一个公开的秘密就是，像企鹅、UC等都有自己的后台绿色通道链接，通过这些链接注册的账号，权重，推荐都会比普通账号要高。
| 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 |
刘伟(致维科技CEO)：通过对于当下女性流行话题的解读，给女性很强的代入感，引起共鸣，引发传播效应，突出品牌关注女性的特点。
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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:
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) { ... }
For faster mobile-friendly development, use these basic utility classes for showing and hiding content by device.
但是，幸福感并一定就能提升工作效率。”杨宁说，“做成一件事情，并且这件事情能够给用户带来很大的价值，同时还能从这件事情上赚到一点钱，才是我创业的终极目标。
” 不过那段时间，王功权做得最多的工作却是流着眼泪裁人“成批解聘从海南跟过来的非专业人员”。厚重的知识和文化素养，总是给人一种不同凡响的感觉。
其中提到商业化引发大洗牌，短视频创业者将进行分化。她唱的是她对自己独特的理解、认识。
| Class | Phones 480px and below | Tablets 767px and below | Desktops 768px and above |
|---|---|---|---|
.visible-phone |
Visible | Hidden | Hidden |
.visible-tablet |
Hidden | Visible | Hidden |
.visible-desktop |
Hidden | Hidden | Visible |
.hidden-phone |
Hidden | Visible | Visible |
.hidden-tablet |
Visible | Hidden | Visible |
.hidden-desktop |
Visible | Visible | Hidden |