CSS에서 @ 규칙 사용

@[KEYWORD] (RULE);

@charset "UTF-8";

@import 'global.css';

/* Namespace for XHTML */
        @namespace url(http://www.w3.org/1999/xhtml);
        /* Namespace for SVG embedded in XHTML */
        @namespace svg url(http://www.w3.org/2000/svg);

@[KEYWORD] {
          /* Nested Statements */
        }

@document 
          /* Rules for a specific page */
          url(http://css-tricks.com/),
          /* Rules for pages with a URL that begin with... */
          url-prefix(http://css-tricks.com/snippets/),
          /* Rules for any page hosted on a domain */
          domain(css-tricks.com),
          /* Rules for all secure pages */
          regexp("https:.*")
        {
          /* Start styling */
          body { font-family: Comic Sans; }
        }

@font-face {
          font-family: 'MyWebFont';
          src:  url('myfont.woff2') format('woff2'),
                url('myfont.woff') format('woff');
        }

@keyframes pulse {
          0% {
            background-color: #001f3f;
          }
          100% {
            background-color: #ff4136;
          }
        }

/* iPhone in Portrait and Landscape */
        @media only screen 
          and (min-device-width: 320px) 
          and (max-device-width: 480px)
          and (-webkit-min-device-pixel-ratio: 2) {
            .module { width: 100%; }
        }

@media print {
        }

@page :first {
          margin: 1in;
        }

/* Check one supported condition */
        @supports (display: flex) {
          .module { display: flex; }
        }
        /* Check multiple conditions */
        @supports (display: flex) and (-webkit-appearance: checkbox) {
          .module { display: flex; }
        }