edit the topic viewers bar

Hello ;

I'm using the User Activity Xon plugin and I'm trying to add an image to a marked field in the image. The line of code I am using is the code below, but it is not working. What am I doing wrong?

Code:

#uaThreadViewContainer .block-minorHeader::before {
    background-image: url(/styles/default/xenforo/kategorikucuklogo.webp);
    background-repeat: no-repeat;
    background-position: 99.5%;
    background-size: 8%;
}

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