<style>
.div_one {
position:relative;
float:left;
left:5px;
background-color:red;
width:30px;
height:30px;
}
</style>
<script>
window.onload=function()
{
var
d = document.createElement('div');
d.className='div_one';
document.body.appendChild(d);
}
</script>