08id选择器.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
/* id一般只允许使用一次*/
#big {
color: red;
}
.tou {
color: skyblue;
}
</style>
</head>
<body>
<div id="big">熊大</div>
<div>熊二</div>
<div class="tou">光头强</div>
</body>
</html>