Setting a length (height or width) for one element minus the variable length of another, i.e. calc(x - y), where y is unknown

Question

I know we can use calc when lengths are defined:

flex-basis: calc(33.33% - 60px);
left: calc(50% - 25px);
height: calc(100em/5);

But what i

Answer 1

In both cases on container css you should put:

#container {
    overflow: hidden;
}

But, it will hide the information that overflows the container. I think that is the point, since you put white-space: nowrap; it means that you don't want to change the height, so you have to hide the text that can't fits the container.