fix codemirror overflow css

www/slide/app-slide.less

@@ -72,12 +72,12 @@ h6 { font-size: 24px; }
     overflow: hidden;
     .CodeMirror {
         resize: none;
-        width: 100vw;
+        //width: 100vw;
     }
     &.cp-app-slide-preview {
         .CodeMirror {
             //resize: horizontal;
-            width: 50vw;
+            //width: 50vw;
         }
     }
 }