XF 1.5 Placing an image to ad_header that will only show on desktop and tablets

Hello everyone. I want to add an 728x90 ad code (not adsense, an image with link) to ad_header template.

But I want it to be shown only on desktop and mobile. How can I do that? I dont have much coding experience.

Afaik @Brogan 's responsive adsense code works for this but I dont know how to convert it to my purpose.

Can anyone help me?

In this guide there is a CSS code that depends on browser width:
<xen:if is="@enableResponsive">
    @media (max-width:800px) {
        .MyContent {
        color: red;

    @media (max-width:610px) {
        .MyContent {
        color: green;

    @media (max-width:480px) {
        .MyContent {
        color: blue;

It's what I need, but I need it's HTML version because of I will be using img src code that depends on browser width.

How can I achieve this?
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