[cXF] Sticky Postbit

[hargrave]

thanks to dear member @hargrave submitted a new resource:

[cXF] Sticky Postbit - To have a sticky postbit

To have a sticky postbit like this:
查看附件 87285

/* [cXF] Sticky Postbit */
@media (min-width: @xf-responsiveMedium) {
    .message-user {
        position: -webkit-sticky;
        position: sticky;
        top: 37px;
        .message-userArrow {
            right: -11px;
        }
    }
}
/**********/

Adjust the top value to suit your needs.

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