Center 1

by LuckyCat

HTML

<div class="outer">
    <div class="inner">
        <div ></div>
    </div>
</div>

CSS

* { margin: 0; padding: 0; }
html, body { height: 100%; }

.outer{
    height:100%;
    width:100%;
    display:table;
    vertical-align:middle;
    
    position: relative;
}
.inner {
    text-align: center; position:relative; vertical-align:middle; display:table-cell;
} 
.inner div {
    display: inline-block;
    vertical-align: top;
    background-repeat: no-repeat;
    position: relative;
    background: green;
    width: 100px; height: 200px;
}