<!DOCTYPE HTML>
<style>
body {
margin: 0;
}
.other {
width: 200px;
height: 200px;
background-color: blue;
display: inline-block;
}
#target {
width: 100px;
height: 100px;
background-color: green;
display: inline-block;
vertical-align: 50px;
}
</style>
<div class="other"></div><div id="target"></div><div class="other"></div>