Edit in JSFiddle

JavaScript
HTML
CSS
Result

window.onload = function () {
    
    //create paper
    var paper = Raphael("canvas");
    paper.rect(60,30,80,20,10).attr({fill:"red"});
    paper.text(100,20,'くまもん').attr({fill:"1"});
    paper.text(100,39,'KUMAMON').attr({fill:"#FFF"});
    
}

<div id="canvas"></div>

body,html
{
    height:100%;
    margin:0;
}

#canvas 
{
    height:100%;
    background:#aaa;
}