id选择器的口诀: 样式#定义, 结构id调用, 只能调用一次, 别人切勿使用
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>id选择器</title>
<style>
#pink {
color: hotpink;
}
#yellow {
color: yellow;
}
#green {
color: forestgreen;
}
</style>
</head>
<body>
<div id="pink">羽神说我想成为粉红色</div>
<div id="yellow">少主说我比较好色</div>
<div id="green">他哥表示我身上有点绿</div>
</body>
</html>