代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box{
width: 500px;
height: 300px;
border: 1px solid;
position: relative;
img{
width: 500px;
height: 300px;
}
.active{
width: 100px;
height: 100px;
background: rgba(255, 255, 0, 0.329);
position: absolute;
left: 0;
top: 0;
display: none;
}
}
.box2{
display: none;
width: 500px;
height: 300px;
border: 1px solid;
position: relative;