/*-------------------------------------------------------------------------------------------- рср тнмш ямя */
:is([data-forum-id="29"], [data-forum-id="31"]) .post:has(.sns_bg.base)::before,
.sns_bg.base::before {
  background: url(https://forumstatic.ru/files/001c/c4/83/26169.jpg?v=1) !important;
}