Centering things without align and center tags 
A common task for CSS is to center text or images. In fact, there are three kinds of centering: Centering lines of text
The most common and (therefore) easiest type of centering is that of lines of text in a paragraph or in a heading. CSS has the property 'text-align' for that:
P { text-align: center }
H2 { text-align: center }
renders each line in a P or in a H2 centered between its margins
Centering a block or image
Sometimes it is not the text that needs to be centered, but the block as a whole. Or, phrased differently: we want the left and right margin to be equal. The way to do that is to set the margins to 'auto'. This is normally used with a block of fixed width, because if the block itself is flexible, it will simply take up all the available width. Here is an example:
P.blocktext {
margin-left: auto;
margin-right: auto;
width: 8em
}
…
<P class="blocktext">This rather…
This is also the way to center an image: make it into block of its own and apply the margin properties to it. For example:
IMG.displayed {
display: block;
margin-left: auto;
margin-right: auto }
…
<IMG class="displayed" src="…" alt="…">
Centering vertically
CSS level 2 doesn't have a property for centering things vertically. There will probably be one in CSS level 3 (see below). But even in CSS2 you can center blocks vertically, by combining a few properties. The trick is to specify that the outer block is to be formatted as a table cell, because the contents of a table cell can be centered vertically.
The example below centers a paragraph inside a block that has a certain given height. A separate example shows a paragraph that is centered vertically in the browser window, because it is inside a block that is absolutely positioned and as tall as the window.
DIV.container {
min-height: 10em;
display: table-cell;
vertical-align: middle }
…
<DIV class="container">
<P>This small paragraph…
</DIV>
Hope this helps you stacey
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