diff --git a/themes/bootstrap/scss/_codemirror.scss b/themes/bootstrap/scss/_codemirror.scss
index 1062ccf486..5326b6b7b2 100644
--- a/themes/bootstrap/scss/_codemirror.scss
+++ b/themes/bootstrap/scss/_codemirror.scss
@@ -14,8 +14,8 @@ $textarea-rows: 15;
 }
 
 .insertRowTable .CodeMirror {
-  height: ceil($textarea-rows * 0.6em);
-  width: ceil($textarea-cols * 0.6em);
+  min-height: ceil($textarea-rows * 0.6em);
+  min-width: ceil($textarea-cols * 0.6em);
   border: 1px solid #a9a9a9;
 }
 
diff --git a/themes/metro/scss/_codemirror.scss b/themes/metro/scss/_codemirror.scss
index 2bb8de6f0a..a14b6ed731 100644
--- a/themes/metro/scss/_codemirror.scss
+++ b/themes/metro/scss/_codemirror.scss
@@ -24,8 +24,8 @@ $textarea-rows: 15 !default;
 }
 
 .insertRowTable .CodeMirror {
-  height: ceil($textarea-rows * 0.6em);
-  width: ceil($textarea-cols * 0.6em);
+  min-height: ceil($textarea-rows * 0.6em);
+  min-width: ceil($textarea-cols * 0.6em);
 }
 
 #pma_console .CodeMirror-gutters {
diff --git a/themes/pmahomme/scss/_codemirror.scss b/themes/pmahomme/scss/_codemirror.scss
index 1d57eedd1b..6ed32a8989 100644
--- a/themes/pmahomme/scss/_codemirror.scss
+++ b/themes/pmahomme/scss/_codemirror.scss
@@ -11,8 +11,8 @@ $textarea-rows: 15;
 }
 
 .insertRowTable .CodeMirror {
-  height: ceil($textarea-rows * 0.6em);
-  width: ceil($textarea-cols * 0.6em);
+  min-height: ceil($textarea-rows * 0.6em);
+  min-width: ceil($textarea-cols * 0.6em);
   border: 1px solid #a9a9a9;
 }