The column's base width. Calculated automatically when the singleColumnScreen option arranges all elements in a single column.
Before rendering the column, the widget considers the screen's width. If the width matches the specified size qualifier, the column will be rendered. There are four size qualifiers in all. The screen option accepts one or several of them separated by a space.
|xs||Stands for "extra small". Screens with width less than 768 pixels.|
|sm||Stands for "small". Screens with width between 768 and 992 pixels.|
|md||Stands for "medium". Screens with width between 992 and 1200 pixels.|
|lg||Stands for "large". Screens with width more than 1200 pixels.|
A factor that defines how much a column width shrinks relative to the rest of the columns in the container.