<style>
#Fonaric {
background-color: #C1D3FB;
top:100px;
position:absolute;
}
.Fonaric {
color:green;
font-weight:700;
height:100px;
}
</style>
<body>
<script>
function DopInfo(str){
var d=document.createElement('div');
d.id='Fonaric';
d.className='Fonaric';
d.style.left = "300px";
d.style.width = "200px";
d.style.border = "red solid 1px";
d.style.padding = "12px";
d.innerHTML = str;
document.body.appendChild(d);
}DopInfo('Привет');
</script>