The following technique allows you to add your content to an HTML element and center it both horizontally and vertically without worrying about its height or width.
display: table;display: table-cell;vertical-align: middle;text-align: center;display: inline-block;text-align: left; or text-align: right;, unless you want text to be centeredHTML
<div class="outer-container">
<div class="inner-container">
<div class="centered-content">
You can put anything here!
</div>
</div>
</div>
CSS
body {
margin : 0;
}
.outer-container {
position : absolute;
display: table;
width: 100%; /* This could be ANY width */
height: 100%; /* This could be ANY height */
background: #ccc;
}
.inner-container {
display: table-cell;
vertical-align: middle;
text-align: center;
}
.centered-content {
display: inline-block;
text-align: left;
background: #fff;
padding: 20px;
border: 1px solid #000;
}
See also this Fiddle!