How to hide span on edit mode and display in display mode

<PublishingWebControls:EditModePanel runat="server" PageDisplayMode="Display" SupressTag="True" CssClass="edit-mode-panel title-edit">
                            <span class="customerLabel">Namn: </span>
                             </PublishingWebControls:EditModePanel>

How could i hide customerLabel on edit mode and display in display mode? Doing like this nothing hapepns?