Limited the width of signature images on mobile devices

I used the be able to limit the width of signature images on mobile devices using this code in extra.less

Code:

.message-signature
{
    .bbWrapper
    {
        .bbImage
        {
            max-width: 600px;
            max-height: 150px;
            overflow-x: auto;
            overflow-y: auto;
        }
    }
}

Has something changed that causes this to not function anymore?

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