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.
因为班加罗尔的快速城市化占用了大量的水资源，使得下游的泰米尔纳德邦农田灌溉受到了严重影响。 其实单纯的投入资金与技术研发，反而就容易了，因为只要是钱能解决的问题，也就不算什么难题。
<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.
马佳佳、大象避孕套，黄太吉煎饼。但是这些产品所呈现的内容，不一定能理解正确。
我还在现实中见过更糟的，一家初创公司在还没拿得出来实际产品的时候，以2000万欧元的估值，通过种子轮融资300万欧，接着再A轮融资，他以50万收入作为估值基础，寻求5000万欧元的融资。此时友友用车的业务已经停止，只能关停线上服务。
| 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 |
曾经意气风发而今难以为继? 正当人们习惯了温城辉的意气风发时，3月27日他发布内部信称开始裁员，并将持续一段时间，被外界解读为“经营已难以为继”。
<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.
以上就是我今天分享的主要内容，总结成两点就是：1、创业不要追求风口，但要把握时机，多尝试到不被很多人关注的“荒野”中寻找创新;2、创业，先让自己成为狼，找一群可以和自己互补的合伙人，带出一群狼。 朱建曾经在一个餐厅问厨师，现在还熬高汤吗?对方回答：不熬了，太费时了。
曾经创业大赛排名靠前的企业，几年期间消失不见。如果我只懂影视剧，不熟悉游戏，怎么会有后来《蜀山战纪》影游联动的案例?” 身边不少朋友看不懂他的投资逻辑，每次往一个陌生领域投钱的时候都觉得他傻，在不断烧钱，劝他老老实实做影视剧多好，风险小，报酬高。
可是我想错了，事实上我已经投入了500万，亏得干干净净，其中300万，都是我融资进来的。 “我正在哄孩子睡觉呢，明天再采吧。
| 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 |