D. Black
Ну во первых вы не поставили код символа на псевдоэлемент к смайлам:
#form-buttons td:hover {color: var(--dark-Light);}
#button-font:before {content: "\f031";}
#button-size:before {content: "\f034";}
#button-bold:before {content: "\f032";}
#button-italic:before {content: "\f033";}
#button-underline:before {content: "\f0cd";}
#button-strike:before {content: "\f0cc";}
#button-indent:before {content: "\f03c";}
#button-left:before {content: "\f036";}
#button-center:before {content: "\f037";}
#button-right:before {content: "\f038";}
#button-link:before {content: "\f0c1";}
#button-spoiler:before {content: "\f070";}
#button-image:before {content: "\f03e";}
#button-video:before {content: "\f16a";}
#button-hide:before {content: "\f023";}
#button-quote:before {content: "\f10e";}
#button-code:before {content: "\f121";}
#button-color:before {content: "\f1fc";}
#button-table:before {content: "\f00a";}
#button-sticker:before {content: "\f118";}
#button-keyboard:before {
content: "\f11c";
font-size: 20px !important;
top: -5px !important;
}
#button-addition:before {content: "\f0fe";}
#button-mask:before {content: "\f21b";}
] нет вообще элемента: #button-smile:before {content: "\бла-бла";}
Во вторых Вы скрыли элемент из видимости:
#pun-main div.catleft, #pun-main div.catright, .punbb .datafield br, .punbb td .modlist, #pun-viewforum th.tc3, #pun-viewforum td.tc3, .modmenu .container span, div#pun-live-rusff, .topic a.sharelink, li.pl-reports, p.lastedit, #pun-break4, #pun-break1, .fs-box li.pa-reg, .fs-box li.pa-posts, .post-links li.pl-email:nth-child(3), .fs-box .post-links li.pl-email, td#button-graffiti_rusff, #form-buttons td#button-files_rusff, #pun-announcement h2, #post-form h2, #pun-ulinks li.item7:nth-child(3), #pun-ulinks li.item3, #pun-ulinks li.item7:nth-child(3), #post-form legend span, td#button-smile, .forum thead, .usertable thead, #profilenav h2, #pun-mod .category table th.tcl, #pun-mod .category table td.tcl, li.pa-online, #pun-messages small#plng, #viewprofile li#pa-invites, #pun-index #pun-crumbs1, #pun-status span.item1, #pun-status span.item2, #pun-modviewforum td.tc3, li#navawards, .punbb .user-avatar .isonline, span.num_msg:before, #pun-register #register .info-box, #pun-title, #s-block, div#pun.ru.isguest.gid3 small#plng {display: none !important;}
