diff --git a/src/_h5ai/client/css/inc/preview.less b/src/_h5ai/client/css/inc/preview.less
index 357948f8..c2c469ce 100644
--- a/src/_h5ai/client/css/inc/preview.less
+++ b/src/_h5ai/client/css/inc/preview.less
@@ -126,6 +126,7 @@
     background-color: rgb(27,27,27);
     // box-shadow: 0 0 8px 0 rgba(0,0,0,0.2);
     box-shadow: 0 0 8px 2px rgba(0,0,0,0.3);
+    height: 48px;
 }
 
 #pv-overlay.fullscreen {