css编写规范

• 内容组成####

/**
 * CONTENTS
 *
 * SETTINGS
 * Global...............Globally-available variables and config.
 *
 * TOOLS
 * Mixins...............Useful mixins.
 *
 * GENERIC
 * Normalize.css........A level playing field.
 * Box-sizing...........Better default `box-sizing`.
 *
 * BASE
 * Headings.............H1–H6 styles.
 *
 * OBJECTS
 * Wrappers.............Wrapping and constraining elements.
 *
 * COMPONENTS
 * Page-head............The main page header.
 * Page-foot............The main page footer.
 * Buttons..............Button elements.
 *
 * TRUMPS
 * Text.................Text helpers.
 */