make border radius consistent on editor views

pages/assets/css/_base.css

@@ -1699,8 +1699,7 @@ section.docs a:hover {
 .listingblock.editor {
   margin-bottom: 1rem;
   background-color: #1e293b;
-  border-bottom-left-radius: 0.65rem;
-  border-bottom-right-radius: 0.65rem;
+  border-radius: 0 0 5px 5px;
   padding-bottom: 0.65em;
   padding-top: 0.62em;
 }
@@ -1730,6 +1729,10 @@ section.docs a:hover {
   margin: 0;
 }
 
+.editor-content .tabs {
+  border-radius: 0 5px 0 0;
+}
+
 .to .editor-content .tabset > .tabs {
   background-color: #1e293b;
 }