CSS
div.outer-div { height: 170px; width: 300px; background-color: lightgray; } div.middle-div { position: relative; top: 50%; -webkit-transform: translateY(-50%); -ms-transform: translateY(-50%); transform: translateY(-50%); }
HTML
<div class=”outer-div”> <div class=”middle-div”></div> </div>