JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mujDiv">
    <div>
        <a href="#">prvni</a>
        <a href="#">druhy</a>
        <a href="#">treti</a>
    </div>
    <div class="abc">
        <a href="#">ctvrty</a>
        <a href="#">paty</a>
        <a href="#">sesty</a>
    </div>
</div>

CSS

#mujDiv div a:first-child{display:none !important;}
#mujDiv div.abc a:first-child{display:inline !important;}