How to prevent images from stretching in css

CSS technology plays a very important role in web design. Through CSS, we can not only control all aspects of web page style, but also achieve many beautiful, orderly, and fully functional web page effects. Among them, the display and control of pictures is one of the technologies that we are most concerned about and need to master. In many cases, we need to make the images appear in the web page according to the design requirements instead of being stretched or compressed. In this case, we need to use CSS technology to achieve this.

First of all, we need to understand some basic concepts related to image size: the space occupied by images on a web page has two dimensions, namely width and height. Therefore, we need to set the width and height attributes of the image. In CSS, these two attributes correspond to width and height respectively.

For example, we can use the following CSS code to make the width of the image 300px and the height 200px:

img{
    width: 300px;
    height: 200px;
}

The above code can be applied to all img tags to change their width and height. Set to 300px and 200px. The effect of this is that no matter what the actual size of the image is, it will be stretched or compressed to 300px and 200px in the web page.

However, in many cases, we do not want the image to be stretched or compressed, but to maintain its original proportions and dimensions. At this point, we need to use some different methods.

The first method is to set the maximum width and maximum height of the image. The effect of this is that if the size of the picture is smaller than the maximum width and maximum height, then it will be rendered according to the original size; if the size of the picture is larger than the maximum width and maximum height, then it will be reduced proportionally until it fits the maximum width and maximum height. up to the maximum height.

For example, we can set the maximum width of the image to 300px and the maximum height to 200px through the following CSS code:

img{
    max-width: 300px;
    max-height: 200px;
}

The above code will ensure that no matter what the actual size of the image is, it will They will not be stretched or compressed, but will maintain their original proportions and dimensions while adapting to the maximum width and height.

The second method is to set the image size to adaptive. The effect of this is that the size of the image will be automatically adjusted according to the size of the container in which it is located, keeping the proportion unchanged.

For example, we can set the width and height of the image to 100% through the following CSS code:

img{
    width: 100%;
    height: auto;
}

In the above code, we set the width to 100% and the height to auto, This means that the width of the image will be automatically adjusted according to the width of the container in which it is located, and the height will be automatically calculated based on the change in width to maintain the original proportions.

To summarize, when we need to control the size of an image, we should give priority to using the maximum width and maximum height attributes, or setting the size to adaptive. These methods can ensure that the display effect of the image is not affected by stretching and compression, while maintaining the original proportion and size, making the web page display more beautiful and comfortable.

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