Issue #3038413 by bnjmnm, lauriii, DyanneNova: Replace editable-area...

Issue #3038413 by bnjmnm, lauriii, DyanneNova: Replace editable-area negative-offset outline with something that IE11 can handle

core/modules/layout_builder/css/layout-builder.css

 .layout-builder {
   background-color: #fff;
-  outline: 3px solid #2f91da;
+  border: 3px solid #2f91da;
   padding: 1.5em 1.5em 0.5em;
-  outline-offset: -3px;
 }
 
 .layout-builder__add-section {