diff --git a/www/code/app-code.less b/www/code/app-code.less
index 4ed6e2837..8772a2653 100644
--- a/www/code/app-code.less
+++ b/www/code/app-code.less
@@ -18,6 +18,7 @@
     .CodeMirror {
         display: inline-block;
         height: 100%;
+        min-height: 100%;
         width: 50%;
         min-width: 20%;
         max-width: 80%;
diff --git a/www/slide/app-slide.less b/www/slide/app-slide.less
index 5b0cb98be..a847f78ce 100644
--- a/www/slide/app-slide.less
+++ b/www/slide/app-slide.less
@@ -33,6 +33,7 @@ h6 { font-size: 24px; }
 
 .CodeMirror {
     height: 100%;
+    min-height: 100%;
     font-size: initial;
 }
 .CodeMirror-focused .cm-matchhighlight {