效果：
实现：
1.定义父盒子，放入5张图片：
<ul>
<li><img src="1.jpg" alt=""><div>Night</div></li>
<li><img src="2.jpg" alt=""><div>Night</div></li>
<li><img src="4.jpg" alt=""><div>Night</div></li>
<li><img src="3.jpg" alt=""><div>Night</div></li>
<li><img src="5.jpg" alt=""><div>Night</div></li>
</ul>
2.给父亲元素宽，高：
ul{
width: 550px;
height: 300px;
overflow: hidden;
cursor: pointer;
}
3.li先默认宽110px：
li{
float: left;
width: 110px;
height: 300px;
list-style: none;
transition: all 1s;
position: relative;
}
img{
height: 100%;
width: 450px;
}
4.图片下面那个文字通过定义伪类元素定位上去
li::after{
content: 'Night';
position: absolute;
bottom: 0;
left: 0;
width: 450px;
height: 30px;
line-height: 30px;
font-size: 16px;
text-align: center;
color: rgb(243, 230, 230);
background-color: rgba(48, 46, 46,.5);
}
5.鼠标经过的li变450px宽，其它li显示25px宽：
ul:hover li{
width: 25px;
}
ul li:hover{
width: 450px;
}
完整代码：
<!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>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body{
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
background-image: radial-gradient(white,black);
}
ul{
width: 550px;
height: 300px;
overflow: hidden;
cursor: pointer;
}
li{
float: left;
width: 110px;
height: 300px;
list-style: none;
transition: all 1s;
position: relative;
}
li::after{
content: 'Night';
position: absolute;
bottom: 0;
left: 0;
width: 450px;
height: 30px;
line-height: 30px;
font-size: 16px;
text-align: center;
color: rgb(243, 230, 230);
background-color: rgba(48, 46, 46,.5);
}
img{
height: 100%;
width: 450px;
}
ul:hover li{
width: 25px;
}
ul li:hover{
width: 450px;
}
</style>
</head>
<body>
<ul>
<li><img src="1.jpg" alt=""><div>Night</div></li>
<li><img src="2.jpg" alt=""><div>Night</div></li>
<li><img src="4.jpg" alt=""><div>Night</div></li>
<li><img src="3.jpg" alt=""><div>Night</div></li>
<li><img src="5.jpg" alt=""><div>Night</div></li>
</ul>
</body>
</html>
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