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CSS method to make the image change size with the screen: 1. Use the "width height auto" attribute to scale the image; 2. Use the "max-width max-height" attribute to set the maximum width and height.
The operating environment of this tutorial: windows7 system, css3 version, Dell G3 computer.
Recommended: "css Video Tutorial"
Sometimes we want the image to scale with the screen size, two situations:
Single picture scaling
Picture scaling within the box
Nude picture scaling
<style type="text/css">
img {
width: auto;
height: auto;
max-width: 100%;
max-height: 100%;
}
</style>
<body>
<img src="https://i.loli.net/2018/06/17/5b2639a6e6c61.jpeg" alt="timg.jpeg" title="timg.jpeg" />
</body> 
The picture is in a box
<style type="text/css">
#box {
width: auto; /* 盒子也要自动缩放 */
height: auto;
max-width: 600px;
max-height: 500px; /* 盒子的高度,需要大于图片100%宽度时 图片的高度 */
border: 5px solid yellow;
}
img {
width: auto;
height: auto;
max-width: 100%; /* 只要宽度100% 结合前面 auto就可以了 */
}
</style>
<body>
<div id="box">
<img src="https://i.loli.net/2018/06/17/5b2639a6e6c61.jpeg" alt="timg.jpeg" title="timg.jpeg" />
下面的文字
</div>
</body>
ps:
1. Use width height auto to zoom
2. Use max-width max-height to set the maximum width and height. 100% means the original maximum.
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