updated styling

com.unity.perception/Editor/Randomization/Uxml/RunInUnitySimulationWindow.uxml

                 <editor:ToolbarMenu name="sys-param" class="unity-base-field__input" style="border-width: 1px;"/>
             </VisualElement>
 
-            <Label text="Optional Configuration" class="sim-window__header-1" style="margin-top: 10px;"/>
+            <Label text="Optional Configuration" class="sim-window__header-1" style="margin-top: 18px;"/>
-            <VisualElement style="align-items: center;">
+            <VisualElement style="align-items: center; margin-top: 8px;">
                 <Button name="run-button" text="Build and Run" style="margin: 10px; padding: 2 20; font-size: 13px;"/>
             </VisualElement>
         </VisualElement>