CSS:
#topic-information a {
color:#ff0;
font-size:16px;
}

#content {
background:#000;
color:#ff0;
}

#forum-posts-list .body {
background:gray;
color:#ff0;
}

#forum-posts-list .footer {
background:#575757;
color:#fff;
border:none;
}

#menu-family {
background:#000;
color:#ff0;
}

body {
background:#000!important;
}

#breadcumb {
background:#000;
color:#ff0;
}

#comments-login {
background:#000;
color:#ff0;
}

#post-submit {
background:#000;
color:#ff0;
}
JS
function insertStr(elementID, newstring) {
$('#' + elementID).val($('#' + elementID).val() + newstring);
}

function newButton(btnName, btnPosAfter, msgString) {
$('#form-post textarea').attr('id', 'message');
$('#forum-codes button[data-codes*="' + btnPosAfter + '"]').after('<button class="'+btnName+' btn btn-info btn-sg smallButton" data-codes="' + btnName + '" type="button">' + btnName + '</button>');
$('#forum-codes button.' + btnName).click(function() { insertStr("message", msgString); });
}

/*
param1: a gomb neve
param2: melyik gomb után jelenjen meg
param3: mit írjon a szövegmezőbe
*/
newButton('FAQ/GYIK', 'spoiler', '');