Untitled

Change property of all instances of element on hover (CSS)
<div class="hover-test">
    <article class="post">ABC</article>
    <article class="post">ABC</article>
    <article class="post">ABC</article>
    <article class="post">ABC</article>
</div>

.post:hover {
background-color:green;
}

.hover-test:hover .post {
background-color: white;
}

.hover-test:hover .post:hover {
background-color: green;
}