XF 2.0 How to limit giphy signature size?

[SuperMonis]

I currently have this in my extra.less

.message-signature
{
    .bbWrapper
    {
        .bbImage
        {
            max-width: 500px;
            max-height: 100px;
            overflow-x: auto;
            overflow-y: auto;
        }
    }
}

It works for scaling down the size of an image however it doesn't affect signatures like this:

 

[SuperMonis]

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[SuperMonis]

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