diff --git a/README.md b/README.md
index 9e7b171..419f2fe 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,8 @@ from jupyterlab_h5web import H5Web
 H5Web('<path to the HDF5 file>')
 ```
 
+The cell height can be resized with the handle at the bottom-right.
+
 An example is provided in [example.ipynb](example.ipynb).
 
 ### Supported file formats
diff --git a/style/index.css b/style/index.css
index 9102ba8..8e36a9a 100644
--- a/style/index.css
+++ b/style/index.css
@@ -5,7 +5,9 @@
 }
 
 .h5web-in-cell {
-  height: 400px;
+  aspect-ratio: 16 / 10;
+  min-height: 500px;
+  max-height: 75vh;
   width: 100%;
   resize: vertical;
   overflow: auto;