JSFiddle - React, Tailwind, and code Playground

HTML

<div id="home-heroImage" onmouseover="document.getElementById('home-hero-pop').style.display = 'block';"  onmouseout="document.getElementById('home-hero-pop').style.display = 'none';"><a href="tbd">testing<br /><br />testing this is my div</a>
<div id="home-hero-pop" style="display: none;" onmouseout="document.getElementById('home-hero-pop').style.display = 'none';"><span style="font-size: 20px;">Welcome</span><br /><br />This div appears on hover<br />but I would like to slide in from the right instead of just appearing.</a><br /></div><!--END home-hero-pop-->
</div><!--//END #home-heroImage-->

CSS

#home-heroImage{padding: 0px;
margin: 0px auto;
width:980px;
height: 525px;
position: relative;
z-index: 1;
    background-color: #fcba2e;
}#home-hero-pop{background-color: #ffffff;
opacity:0.8;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
filter: alpha(opacity=80);
font: 16px Helvetica,Arial,sans-serif;
font-weight: bold;
color: #6d6e70;
text-align: left;
padding: 10px;
position: absolute;
right: 0px;
top: 0px;
height: 505px;
width: 460px;
z-index: 2;
}