文档更新

doc/slide/whyEcharts.html

@@ -89,6 +89,10 @@
                 border:0;
                 background:none
             }
+            .reveal img {
+                max-width:100%;
+                max-height:100%;
+            }
             .reveal .slides>section, .reveal .slides>section>section {
                 padding:0;
             }