JSFiddle - React, Tailwind, and code Playground
HTML
<span class="buy1">
<h3><a href="#">buy</a></h3>
</span>
CSS
.buy1 {
opacity: 0;
}
JavaScript
$( "span.buy1" ).hover(function() {
$("span.buy1").fadeTo(1,1);
}, function() {
$("span.buy1").fadeTo(1,0);
});