Fix cell tools styling

packages/notebook/style/index.css

@@ -181,12 +181,6 @@
 }
 
 
-.jp-CellTools .jp-MetadataEditor-host {
-  background-color: white;
-  border-color: var(--jp-border-color1);
-}
-
-
 .jp-ActiveCellTool {
   padding: 12px;
   border-bottom: 1px solid var(--jp-border-color1);
@@ -244,7 +238,14 @@
 }
 
 
-.jp-MetadataEditor.jp-mod-collapsed {
+.jp-MetadataEditorTool .jp-JSONEditorWidget {
+  background-color: white;
+  border: var(--jp-border-width) solid var(--jp-border-color1);
+  margin: 8px;
+}
+
+
+.jp-MetadataEditorTool .jp-JSONEditorWidget.jp-mod-collapsed {
   display: none;
 }
 
@@ -254,6 +255,17 @@
 }
 
 
+.jp-KeySelector .jp-select-wrapper {
+  font-size: var(--jp-ui-font-size1);
+  color: var(--jp-ui-font-color0);
+}
+
+
+.jp-KeySelector .jp-select-wrapper:not(.jp-mod-focused) {
+  border: var(--jp-border-width) solid var(--jp-border-color1);
+}
+
+
 .jp-KeySelector label {
   line-height: 1.4;
 }