Center a DIV horizontally and vertically

Question

Can I  CENTER A DIV vertically and horizontally? But the content should not be cut when the window is smaller than the content The div must have a background color and width and height.  

CSS:

body { margin: 0px; }

.background {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: yellow;
}

/* 
is there a better way than the absolute positioning and negative margin to center the div .content: div with background color a width and a hight?: 
*/ 


.content {
    width: 200px;
    height: 600px;
    background-color: blue;

    position:absolute;
    top:50%;
    left:50%;
    margin-left:-100px;/* half width*/
    margin-top:-300px;/* half height*/
}

HTML:

<div class="background">
    <div class="content"> some text </div>
</div>

Can someone please help me with this?