diff --git a/static/holder.css b/static/holder.css
index 6e0fc4c..7047afc 100644
--- a/static/holder.css
+++ b/static/holder.css
@@ -178,12 +178,19 @@
 .scad-panel {
   position: absolute;
   left: 0; right: 0; bottom: 0;
-  height: 45%;
+  height: 30%;
+  min-height: 180px;
   background: var(--bg, #11141a);
   border-top: 1px solid var(--border, #2a2f3a);
   display: flex;
   flex-direction: column;
   z-index: 2;
+  overflow: hidden;
+}
+/* The [hidden] attribute alone is overridden by display:flex above —
+ * make the hide explicit so the Close button actually closes the panel. */
+.scad-panel[hidden] {
+  display: none;
 }
 .scad-panel-bar {
   display: flex;