diff --git a/HISTORY.md b/HISTORY.md
index cd04e65..181c1c2 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,8 @@ https://github.com/josdejong/jsoneditor
 
 ## not yet released, version 5.5.6
 
+- Fixed #303: editor contents collapsed when the parent div of the JSONEditor
+  has no height set.
 - Improved example 04_load_and_save.html. Thanks @RDCH106.
 
 
diff --git a/src/css/jsoneditor.css b/src/css/jsoneditor.css
index 21088c7..f5017df 100644
--- a/src/css/jsoneditor.css
+++ b/src/css/jsoneditor.css
@@ -1,4 +1,8 @@
 
+div.jsoneditor {
+
+}
+
 div.jsoneditor-field,
 div.jsoneditor-value,
 div.jsoneditor-readonly {
@@ -206,6 +210,11 @@ div.jsoneditor-outer {
   box-sizing: border-box;
 }
 
+textarea.jsoneditor-text,
+.ace-jsoneditor {
+  min-height: 150px;
+}
+
 div.jsoneditor-tree {
   width: 100%;
   height: 100%;