How to make the width of child elements adapt to the content without filling the parent container in Flex layout?

Cleverly use Flex layout to achieve adaptive width of child elements content

When using Flex layouts, it is often necessary that the child element width be automatically adjusted according to the content rather than filling the entire parent container. For example, in a vertically arranged Flex container, how can the width of the child elements adapt to the content while keeping the background color displayed intact, and avoid manually setting the fixed width, resulting in incomplete display of content? This article will provide a concise solution.

Problem scenario:

Suppose a Flex container, arranged two blocks vertically. The upper part of the content is adaptable in width, and the lower part (for example, the "VAT Normal Invoice" block) also needs to adapt to the width according to the content to avoid background color overflow and prevent incomplete display of the content.

Core question: How to make the width of the "VAT Normal Invoice" block dynamically adjust based on the content, rather than occupying the entire width of the parent container.

Solution:

The key is to set width attribute of the "VAT Normal Invoice" block to fit-content . The fit-content attribute will automatically adjust the width of the element according to its content size, perfectly solving the problems of background color overflow and incomplete content display, ensuring that the content is fully displayed while maintaining visual coordination. Just simply set this property to achieve the desired effect.

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