Determining how Flexboxes are to handle overflow
Depending on how you have defined a Flexbox, it is possible that the content within that Flexbox can "overflow" the available space. This is especially true when the width or height of the Flexbox is defined by pixels. When this happens you have three options for how to handle the overflow content: by hiding it, by wrapping it, or by allowing it to scroll.
To determine how Flexboxes are to handle overflow of content, use this procedure: