Help with responsive banner code in House Ads on mobile

AI-generated summary

Jay91 is seeking assistance with making a responsive banner ad for mobile devices. The code presented works fine on desktop, but on mobile, the banner appears very small. Jay91 also mentions the restriction of only being able to use HTML. Stephen queries how that restriction affects the usage of @media, to which Jay91 admits a lack of knowledge on how to employ it and asks for guidance.

For context, here are the relevant posts: post 1, post 3, post 4, and post 5.

Hello friends,

we use the code below to show in house responsive image ads

<a href="MY WEBSITE LINK" target="_blank">
    <img src="IMAGE LINK" style='width:69%;' border="0" class="banner" alt="Null">
  </a>

on the desktop is fine but on the mobile view, the banner is showing very small. see the below

!! the filed only accepts HTML.

What’s your point?

How does that prevent you from using @media?

am sorry i don`t know how to use it.
can you advise?