you can add this in your css it will work just change what needs to be
.pec[data-group_id="4"] {
}
aside.pec[data-group_id="4"] {
background: url("/Image/giphy.gif") repeat 50% 50%;
background-repeat: no-repeat;
background-size: cover;
}
aside.pec[data-group_id="4"] {
background: #ff0000 !important;
background: -moz-linear-gradient(top, #ff0000 0%, #18138e 92%) !important;
background: -webkit-linear-gradient(top, #ff0000 0%,#18138e 92%) !important;
background: linear-gradient(to bottom, #ff0000 0%,#18138e 92%) !important;
}
than go to post container look for
<article {{if $comment->author()->hasHighlightedReplies()}}data-memberGroup="{$comment->author()->member_group_id}" {{endif}} id='elComment_{$comment->$idField}' class='cPost ipsBox {{if $otherClasses}}{$otherClasses}{{endif}} ipsComment {{if ( settings.reputation_enabled and settings.reputation_highlight and $comment->reactionCount() >= settings.reputation_highlight ) OR $comment->isFeatured()}}ipsComment_popular{{endif}} ipsComment_parent ipsClearfix ipsClear ipsColumns ipsColumns_noSpacing ipsColumns_collapsePhone {{if $comment->author()->hasHighlightedReplies()}}ipsComment_highlighted{{endif}}{{if $comment->isIgnored()}}ipsHide{{endif}} {{if $comment->hidden() OR $item->hidden() === -2}}ipsModerated{{endif}}'>
change with
<article {{if $comment->author()->hasHighlightedReplies()}}data-memberGroup="{$comment->author()->member_group_id}" {{endif}} id='elComment_{$comment->$idField}' class='pec cPost ipsBox {{if $otherClasses}}{$otherClasses}{{endif}} ipsComment {{if ( settings.reputation_enabled and settings.reputation_highlight and $comment->reactionCount() >= settings.reputation_highlight ) OR $comment->isFeatured()}}ipsComment_popular{{endif}} ipsComment_parent ipsClearfix ipsClear ipsColumns ipsColumns_noSpacing ipsColumns_collapsePhone {{if $comment->author()->hasHighlightedReplies()}}ipsComment_highlighted{{endif}}{{if $comment->isIgnored()}}ipsHide{{endif}} {{if $comment->hidden() OR $item->hidden() === -2}}ipsModerated{{endif}}' data-group_id='{$comment->author()->member_group_id}'>
than look for
<aside class='ipsComment_author cAuthorPane ipsColumn ipsColumn_medium ipsResponsive_hidePhone'>
change with
<aside class='pec ipsComment_author cAuthorPane ipsColumn ipsColumn_medium ipsResponsive_hidePhone' data-group_id='{$comment->author()->member_group_id}'>