index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link type="text/css" rel="stylesheet" href="style.css"/>
<script type="text/javascript" src="//mbostock.github.com/d3/d3.js"></script>
</head>
<body>
<div id="viz"></div>
<script type="text/javascript">
var myCircle = d3.select("#viz")
.append("svg")
.attr("width", 1000)
.attr("height", 1000);
myCircle
.append("circle")
.style("stroke", "black")
.style("fill", "white")
.attr("r", 40)
.attr("cx", 50)
.attr("cy", 50)
.on("mouseover", function(){d3.select(this).style("fill", "mediumvioletred");})
.on("mouseout", function(){d3.select(this).style("fill", "aliceblue");});
</script>
</body>
</html>
style.css
@import url("//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,700italic,400,300,700");
body {
font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Helvetica, Arial, sans-serif;
}
.d3-unconf {
color: #222;
font-size: 44px;
font-style: normal;
font-weight: 300;
text-rendering: optimizelegibility;
}