How to elegantly achieve high adaptability of the middle content in the three-line layout?

Three-line layout of web pages: How to make the intermediate content highly adaptable?

In web design, it is often necessary to build a three-line layout, where the head and bottom heights are fixed, while the height of the middle part is dynamically adjusted according to the content. When the middle content is small, the page height is lower; when the content increases, a scroll bar appears in the middle part, and the page height increases accordingly, thereby making full use of the page space. How to achieve this adaptive layout gracefully?

There are many ways to achieve this effect, the key is whether the head and bottom heights are fixed.

Method 1: Fixed height of the head and bottom

If the container heights of the head and bottom are fixed, you can use max-height and calc() functions of CSS. max-height limits the maximum height of the intermediate container, while calc() calculates the remaining space and allocates it to the intermediate container. This method is simple and easy to use and is suitable for cases where the head and bottom heights are known.

Method 2: Head and bottom that are not fixed in height but with height restrictions

If the container heights at the head and bottom are not fixed, but there is a maximum height limit, then the Flex layout is a more ideal choice. Flex layout can flexibly control the arrangement and size of elements in the container. By setting the appropriate Flex properties, the intermediate container can adapt to the height according to the content, while the head and bottom containers can also be kept within reasonable range. This method is more flexible and more adaptable.

No matter which method you choose, you need to adjust the code according to the actual situation to ensure the stability and compatibility of the layout. Proficiency in max-height , calc() and Flex layouts is the key to solving such problems. By cleverly applying these CSS features, it is easy to realize a three-line layout with highly adaptable intermediate content.

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