JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outter">
<div class="center">
<div class="inner">
<div id="content">
    <img src="images/intro_7.jpg">
        aaa
</div>
</div>
</div>
</div>

CSS

.outter {
    display: table;
    position: absolute;
    height: 100%;
    width: 100%;
}
.center {
    display: table-cell;
    vertical-align: middle;
}

.inner {
    margin-left: auto;
    margin-right: auto;
}
#content {
    width: 100%;
    text-align:center;
}

#content img {
    width: 50%;
    opacity: 0.75;
}

#content img:hover {
    opacity: 1;
}