/*-------------------------------------------------------------------------------------------- рср тнмш янж яерх */
:is([data-forum-id="30"], [data-forum-id="28"]) .post:has(.sm_bg.base) .sm_body::after, 
.sm_bg.base::before {
background: url(https://forumstatic.ru/files/001c/c4/83/39043.png?v=1);
}