Add maximise widget functionality (#7098)

Co-authored-by: J. Ryan Stinnett <jryans@gmail.com>

res/css/structures/_RightPanel.scss

@@ -22,7 +22,7 @@ limitations under the License.
     display: flex;
     flex-direction: column;
     border-radius: 8px;
-    padding: 8px 0;
+    padding: $container-border-width 0;
     box-sizing: border-box;
     height: 100%;
     contain: strict;