It can be difficult to write stylesheets that are flexible to different lengths of content. The great thing about WordPress is that clients can make edits to content directly, but if the stylesheet is not flexible this can cause issues. I would like to cover some pitfalls and solutions for writing flexible styles.
An often encountered pattern found in websites is a grid of “cards”, usually with some combination of a title, picture, excerpt, and link. Using floats, this would need to be styled by either defining a height and dealing with overflow or simply having mismatched cards if the content wasn’t of similar length. By using flexbox, you can easily match the height of each row.
Another common difficulty is writing navigation menus that can deal with both small and large quantities of menu items. By combining nth-child and nth-last-child, you can write “quantity queries” that can greatly simplify the development of flexible menu styling: all without writing conditional logic in a WordPress filter.
A future tool that would be great for writing flexible styles is the container query, proposed by the RICG. This would allow for the styling of an element based on the width of its container, as opposed to the width of the viewport.
By thinking creatively with CSS, you can ensure that your stylesheets are flexible no matter the content.