VALERA - Responsiv HTML Template based on Bootstrap, from Twitter网站模板http://www.51xuediannao.com/muban/

Button	class=""	Description
	`btn`	Standard gray button with gradient
	`btn btn-primary`	Provides extra visual weight and identifies the primary action in a set of buttons
	`btn btn-info`	Used as an alternate to the default styles
	`btn btn-success`	Indicates a successful or positive action
	`btn btn-warning`	Indicates caution should be taken with this action
	`btn btn-danger`	Indicates a dangerous or potentially negative action
	`btn btn-inverse`	Alternate dark gray button, not tied to a semantic action or use

/// Buttons for actions

As a convention, buttons should only be used for actions while hyperlinks are to be used for objects. For instance, "Download" should be a button while "recent activity" should be a link.

Button styles can be applied to anything with the .btn class applied. However, typically you'll want to apply these to only <a> and <button> elements.

/// Cross browser compatibility

IE9 doesn't crop background gradients on rounded corners, so we remove it. Related, IE9 jankifies disabled button elements, rendering text gray with a nasty text-shadow that we cannot fix.

/// Multiple sizes

Fancy larger or smaller buttons? Add .btn-large, .btn-small, or .btn-mini for two additional sizes.

/// Disabled state

For disabled buttons, add the .disabled class to links and the disabled attribute for <button> elements.

Primary link Link

Heads up! We use .disabled as a utility class here, similar to the common .active class, so no prefix is required.

/// One class, multiple tags

Use the .btn class on an <a>, <button>, or <input> element.

<a class="btn" href="">Link</a>
<button class="btn" type="submit">
  Button
</button>
<input class="btn" type="button"
         value="Input">
<input class="btn" type="submit"
         value="Submit">

As a best practice, try to match the element for you context to ensure matching cross-browser rendering. If you have an input, use an <input type="submit"> for your button.

icon-glass
icon-music
icon-search
icon-envelope
icon-heart
icon-star
icon-star-empty
icon-user
icon-film
icon-th-large
icon-th
icon-th-list
icon-ok
icon-remove
icon-zoom-in
icon-zoom-out
icon-off
icon-signal
icon-cog
icon-trash
icon-home
icon-file
icon-time
icon-road
icon-download-alt
icon-download
icon-upload
icon-inbox
icon-play-circle
icon-repeat

icon-refresh
icon-list-alt
icon-lock
icon-flag
icon-headphones
icon-volume-off
icon-volume-down
icon-volume-up
icon-qrcode
icon-barcode
icon-tag
icon-tags
icon-book
icon-bookmark
icon-print
icon-camera
icon-font
icon-bold
icon-italic
icon-text-height
icon-text-width
icon-align-left
icon-align-center
icon-align-right
icon-align-justify
icon-list
icon-indent-left
icon-indent-right
icon-facetime-video
icon-picture

icon-pencil
icon-map-marker
icon-adjust
icon-tint
icon-edit
icon-share
icon-check
icon-move
icon-step-backward
icon-fast-backward
icon-backward
icon-play
icon-pause
icon-stop
icon-forward
icon-fast-forward
icon-step-forward
icon-eject
icon-chevron-left
icon-chevron-right
icon-plus-sign
icon-minus-sign
icon-remove-sign
icon-ok-sign
icon-question-sign
icon-info-sign
icon-screenshot
icon-remove-circle
icon-ok-circle
icon-ban-circle

icon-arrow-left
icon-arrow-right
icon-arrow-up
icon-arrow-down
icon-share-alt
icon-resize-full
icon-resize-small
icon-plus
icon-minus
icon-asterisk
icon-exclamation-sign
icon-gift
icon-leaf
icon-fire
icon-eye-open
icon-eye-close
icon-warning-sign
icon-plane
icon-calendar
icon-random
icon-comment
icon-magnet
icon-chevron-up
icon-chevron-down
icon-retweet
icon-shopping-cart
icon-folder-close
icon-folder-open
icon-resize-vertical
icon-resize-horizontal

/// Built as a sprite

Instead of making every icon an extra request, we've compiled them into a sprite—a bunch of images in one file that uses CSS to position the images with background-position. This is the same method we use on Twitter.com and it has worked well for us.

All icons classes are prefixed with .icon- for proper namespacing and scoping, much like our other components. This will help avoid conflicts with other tools.

Glyphicons has granted us use of the Halflings set in our open-source toolkit so long as we provide a link and credit here in the docs. Please consider doing the same in your projects.

/// How to use

Bootstrap uses an <i> tag for all icons, but they have no case class—only a shared prefix. To use, place the following code just about anywhere:

<i class="icon-search"></i>

There are also styles available for inverted (white) icons, made ready with one extra class:

<i class="icon-search icon-white"></i>

There are 120 classes to choose from for your icons. Just add an <i> tag with the right classes and you're set. You can find the full list in sprites.less or right here in this document.

Heads up! When using beside strings of text, as in buttons or nav links, be sure to leave a space after the <i> tag for proper spacing.

/// Use cases

Icons are great, but where would one use them? Here are a few ideas:

As visuals for your sidebar navigation
For a purely icon-driven navigation
For buttons to help convey the meaning of an action
With links to share context on a user's destination

Essentially, anywhere you can put an <i> tag, you can put an icon.

/// Examples

Use them in buttons, button groups for a toolbar, navigation, or prepended form inputs.

/// Buttons and Icons

Buttons