invoke css

IPython/html/static/style/ipython.min.css

@@ -867,6 +867,7 b' div.output_area pre {'
 /* This class is for the output subarea inside the output_area and after
    the prompt div. */
 div.output_subarea {
+  overflow-x: auto;
   padding: 0.4em;
   /* Old browsers */
   -webkit-box-flex: 1;

IPython/html/static/style/style.min.css

@@ -9643,6 +9643,7 b' div.output_area pre {'
 /* This class is for the output subarea inside the output_area and after
    the prompt div. */
 div.output_subarea {
+  overflow-x: auto;
   padding: 0.4em;
   /* Old browsers */
   -webkit-box-flex: 1;