What flex-item CSS property sets its ability to shrink if necessary?

Answer 1

You'll need to be more specific with your question, but I believe you are referring to if the screen's width or height is reduced, what will keep the flex-item in the same line.

If that's the case, then you will want "flex-wrap: no-wrap;"

.flex-container {

display: flex;

flex-wrap: nowrap;

}