我试着写了如下一段代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Review</title>
<link rel="stylesheet" type="text/css" href="styles/main.css"/>
</head>
<body>
<div class="div1">
<div class="div2"></div>
</div>
<div class="div3">
<div class="div4"></div>
</div>
</body>
</html>main.css
* {
margin: 0;
padding: 0;
}
.div1 {
width: 400px;
height: 400px;
margin: 400px auto;
background-color: red;
position: relative;
z-index: 2;
}
.div2 {
width: 300px;
height: 300px;
background-color: green;
position: absolute;
left: 50px;
top: 50px;
}
.div3 {
width: 200px;
height: 200px;
background-color: yellow;
position: relative;
top: -700px;
left: -400px;
z-index: 3;
}
.div4 {
width: 100px;
height: 100px;
background-color: #ccc;
position: absolute;
left: 50px;
top: 50px;
}我看不到div3和div4，说明了z-index并没有起作用。这是怎么回事？求大神帮忙看看！
.div3 {
width: 200px;
height: 200px;
background-color: yellow;
position: relative;
***top: -700px;
left: -400px;***
z-index: 3;
}
这个超出了，改小一点应该就看得到了。