Image size adaptation

We can easily implement image adaptation through bootstrap:

If you do not intend to reference bootstrap, simply css, we can check the definition of the img-responsive class in bootstrap:

.img-responsive { display: inline-block; height: auto; max-width: 100%;}

In this way, we use pure CSS to complete the image adaptation;
Explain the code: display allows the image to be presented in a restrained form. And the width and height can be set;
Then use max-width to set the width, which can override the settings of the width attribute of the label by other classes; height makes the height of the picture adaptive, and can also be set in reverse, but this is generally the case More appear.

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