diff --git a/www/slide/slide.css b/www/slide/slide.css
index efa8e8fee..51eb88edd 100644
--- a/www/slide/slide.css
+++ b/www/slide/slide.css
@@ -300,6 +300,8 @@ body .CodeMirror-focused .cm-matchhighlight {
   width: 90%;
   margin: auto;
   padding-left: .25vw;
+  overflow-x: auto;
+  overflow-y: hidden;
 }
 .cp div#modal #content .slide-frame ul,
 .cp #print .slide-frame ul,
diff --git a/www/slide/slide.less b/www/slide/slide.less
index 146f3e760..67db16e10 100644
--- a/www/slide/slide.less
+++ b/www/slide/slide.less
@@ -266,6 +266,8 @@ div#modal #content, #print {
             width: 90%;
             margin: auto;
             padding-left: .25vw;
+            overflow-x: auto;
+            overflow-y: hidden;
         }
 
         ul, ol {