This is an example that illustrates how centered text can be framed into a box which in turn is supposed to expand about 40% width-wide.

This is an example that illustrates how text can be framed into a box which in turn is supposed to expand about 60% width-wide.

Here it's a case where the box has a fixed height of 100px, 30% of the width, and in case it overflows there will be a scroll bar to the side.