JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="b2j_k2_news_slider_ul_96">
            <li data-k2id="32"><span class="date pos_1">07:23</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=32:aaa">AAA...</a><div class="clearfix"></div></li><li data-k2id="31"><span class="date pos_1">08:33</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=31:ֆֆֆ">ՖՖՖ...</a><div class="clearfix"></div></li><li data-k2id="30"><span class="date pos_1">08:30</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=30:ասդասդէէէ">ասդասդԷԷԷ...</a><div class="clearfix"></div></li><li data-k2id="29"><span class="date pos_1">08:28</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=29:աաա">աաա...</a><div class="clearfix"></div></li><li data-k2id="28"><span class="date pos_1">08:25</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=28:асдасд">асдасдասդասդ...</a><div class="clearfix"></div></li><li data-k2id="27"><span class="date pos_1">08:03</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=27:асдасдасասդասդ">асдасдасասդասդ...</a><div class="clearfix"></div></li><li data-k2id="26"><span class="date pos_1">10:53</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=26:wsdfsd">wsdfsd...</a><div class="clearfix"></div></li><li data-k2id="25"><span class="date pos_1">09:22</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=25:կյգկ">կյգկ...</a><div class="clearfix"></div></li><li data-k2id="24"><span class="date pos_1">09:20</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=24:սդֆսդֆ">սդֆսդֆ...</a><div class="clearfix"></div></li><li data-k2id="22"><span class="date pos_1">09:20</span><a href="/users/armen/v2/index.php?option=com_k2&amp;view=item&amp;id=22:բլլօօ">բլլօօ...</a><div class="clearfix"></div></li><li data-k2id="23"><span class="date pos_1">09:17</span><a...

CSS

ul{overflow:hidden}

JavaScript

var viewport_size = 0;
        $("li:lt(8)").each( function() {
            viewport_size += $(this).height();
        });
$("ul").height(viewport_size);alert(viewport_size);