[noypiscripter]

You might have gotten this from my site where the green online icon glows. It doesn't look good on forum icons.

Anyway, It's just a custom CSS. You can remove it from css_additional template in AdminCP or via Sitebuilder > Style > CSS Editor. I see that you only have few CSS in css_additional template. Everything is for that glowing ring except for this one:

.b-editor--cke-toolbar-is-hidden .cke_top {
    display: block
}

So if you remove everything except the code above, it will remove the red glowing ring.